AI-generatedMarathon, Florida Keys at a glance
- Best time
- Mar – May, Jul, Nov – Dec
- Warmest month
- Aug · 29°
- Warmest sea
- Aug · 30.1°
- Sunshine a year
- 2,820 h
- Rain a year
- 807 mm
- Climate
- Subtropical
- Time zone
- UTC−5 / UTC−4
- Elevation
- 1 m
Climate in Marathon, Florida Keys
Marathon, Florida Keys has a subtropical climate with warm summers and mild winters. August is the warmest month with average highs of 29 °C, while January is the coolest at 22 °C. With around 2,820 hours of sunshine a year, Marathon, Florida Keys is sunny; April is the sunniest month with 9.0 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Excellent
Best time to visit: March – May, July, November – December
October is the peak of the hurricane season
Keep in mindFrequent rainStorm season
A typical day in October
- Morning, 08:00: about 26°
- Midday, 13:00: about 27°
- Afternoon, 16:00: about 27°
- Evening, 20:00: about 27°
- Night, 23:00: about 26°
07:2118:58
Warm enough for a T-shirt in the evening.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:07–07:52 · evening 18:28–19:13
- Blue hour
- Morning 06:59–07:07 · evening 19:13–19:21
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Marathon, Florida Keys in October?
In October, Marathon, Florida Keys is hot: daytime highs average 27 °C, and even at night it stays warm at around 26 °C. The sea averages 28.2 °C – lovely and warm for swimming. The sun shines for around 7 hours a day. Rain is frequent, with about 13 rainy days and 106 mm in total. The air is often humid and muggy. It is often windy, with gusts of around 28 km/h. All in all, October is an excellent month for a holiday in Marathon, Florida Keys.
More details for October
- Daylight
- 11 h 37 min07:21 – 18:58
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 29 daysdew point 18 °C or moreAll months
- Wind
- 28 km/haverage daily peakAll months
- Cloud cover
- 50 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %67 %
- Few rainy daysweight 20 %39 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
- Windproof jacket
Sea temperature in Marathon, Florida Keys
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 27.6 – 28.8 °C
Swimming season: All year
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Marathon, Florida Keys ranges from 23.6 °C in January to 30.1 °C in August. At 20 °C and more, the sea is warm enough for swimming all year round.
The sea temperature varies from year to year: in August, eight out of ten years were between 29.5 and 30.6 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 23.6° | 22.5° | 24.5° | pleasant |
| FebruaryFeb | 23.7° | 22.8° | 24.9° | pleasant |
| MarchMar | 24.5° | 23.4° | 25.4° | pleasant |
| AprilApr | 25.7° | 25.0° | 26.6° | pleasant |
| MayMay | 27.3° | 26.6° | 27.8° | warm |
| JuneJun | 28.8° | 28.2° | 29.3° | warm |
| JulyJul | 29.7° | 28.8° | 30.3° | very warm |
| AugustAug | 30.1° | 29.5° | 30.6° | very warm |
| SeptemberSep | 29.6° | 28.9° | 30.2° | very warm |
| OctoberOct | 28.2° | 27.6° | 28.8° | warm |
| NovemberNov | 26.3° | 25.5° | 27.1° | warm |
| DecemberDec | 24.9° | 24.3° | 25.7° | pleasant |
Sunshine hours in Marathon, Florida Keys
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 7.0 of 11.6 hours of daylight in Marathon, Florida Keys, 60 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Marathon, Florida Keys
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 8 · very highStay in the shade around midday; SPF 50, clothing, hat and sunglasses.
The sun is strongest in June (UV 12).
Minutes until sunburn in October
- Very fair skin
- about 15 min
- Fair skin
- about 20 min
- Light brown skin
- about 30 min
- Olive skin
- about 40 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Marathon, Florida Keys: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Marathon, Florida Keys has about 13 rainy days with 106 mm of rain in total.
Wind and clouds in Marathon, Florida Keys
How breezy and how cloudy Marathon, Florida Keys is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Marathon, Florida Keys typically peaks at 28 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting, and here it gets there all year.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 50 % of the sky over Marathon, Florida Keys: variable cloud, with about 7.0 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Marathon, Florida Keys
How often the day gets hot in Marathon, Florida Keys (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Marathon, Florida Keys has about 0 hot days, with an average daytime high of 27 °C: often muggy. The air feels warmer than the thermometer says: light, airy clothes and slow days help.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Marathon, Florida Keys
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Warm 20–24°
- Hot 24° and more
- muggy month (10+ muggy days)
HotOctober: nights around 26°. Hot nights: air conditioning makes sleeping much easier. Muggy on about 29 days (dew point 18 °C or more).
The coolest nights are in January (20°), the warmest in August (28°). Nights stay tropical all year (20 °C and more), so a room with air conditioning or at least a fan pays off. It is muggy (dew point 18 °C or more) on about 289 days a year, mostly all year round.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 74 | 22° | 20° | 23.6° | 6.7 h | 6 | 31 |
| FebruaryFeb | 81 | 23° | 21° | 23.7° | 7.2 h | 4 | 30 |
| MarchMar | 88 | 24° | 22° | 24.5° | 8.0 h | 5 | 30 |
| AprilApr | 98 | 25° | 24° | 25.7° | 9.0 h | 5 | 36 |
| MayMay | 94 | 27° | 25° | 27.3° | 9.0 h | 8 | 67 |
| JuneJun | 82 | 28° | 27° | 28.8° | 8.0 h | 14 | 116 |
| JulyJul | 85 | 29° | 27° | 29.7° | 8.7 h | 14 | 74 |
| AugustAug | 81 | 29° | 28° | 30.1° | 8.3 h | 16 | 112 |
| SeptemberSep | 75 | 29° | 27° | 29.6° | 7.1 h | 17 | 134 |
| OctoberOct | 81 | 27° | 26° | 28.2° | 7.0 h | 13 | 106 |
| NovemberNov | 90 | 25° | 23° | 26.3° | 6.8 h | 6 | 38 |
| DecemberDec | 83 | 24° | 22° | 24.9° | 6.7 h | 5 | 34 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
24.71° N, 81.09° W · 1 m · America/New_York
Best time to visit Marathon, Florida Keys
The best time to visit Marathon, Florida Keys is from March to May and in July and from November to December. For a beach holiday with the sea above 21 °C, go from February to May and from November to December. For sightseeing, day trips and hiking, conditions are most comfortable from November to May. Rain is most frequent from June to October; the wettest month is September with 134 mm.
Marathon, Florida Keys through the seasons
How the weather changes over the seasons, with averages for each.
Marathon, Florida Keys in spring
Mar – May
Excellent
- 24–27 °C by day
- Sea 26 °C
- 9 h of sun a day
- 18 rainy days in all
Marathon, Florida Keys in summer
Jun – Aug
Excellent
- 28–29 °C by day
- Sea 30 °C
- 8 h of sun a day
- 44 rainy days in all
Marathon, Florida Keys in autumn
Sep – Nov
Excellent
- 25–29 °C by day
- Sea 28 °C
- 7 h of sun a day
- 36 rainy days in all
Marathon, Florida Keys in winter
Dec – Feb
Good
- 22–24 °C by day
- Sea 24 °C
- 7 h of sun a day
- 15 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Marathon, Florida Keys for you.
Your best months: April – May, July
Based on the climate averages; tap a month to see its details.
Compare two months in Marathon, Florida Keys
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
April has the better holiday weather in Marathon, Florida Keys: score 98 against 81. In April, days are 2 °C cooler than in October. The sea is 2 °C cooler in April. April has 8 fewer rainy days. The sun shines 2 hours longer a day in April.
| Month | October | April |
|---|---|---|
| Weather score | 81 | 98better |
| Day high | 27° | 25° |
| Night low | 26° | 24° |
| Sea | 28.2° | 25.7° |
| Sunshine | 7.0 h | 9.0 hbetter |
| Rainy days | 13 | 5better |
| Rainfall | 106 mm | 36 mmbetter |
| Muggy days | 29 | 21better |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Feb – May, Nov – Dec
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Nov – May
15–28 °C and not too much rain
Rainy months
Jun – Oct
12 or more rainy days
Marathon, Florida Keys month by month
The typical weather for every month at a glance.
74January22° · Sea 24° · 7 h
In January, Marathon, Florida Keys is warm: daytime highs average 22 °C, and even at night it stays warm at around 20 °C. The sea averages 23.6 °C – pleasant for swimming. The sun shines for around 7 hours a day. Rain falls on about 6 days, adding up to 31 mm. It is often windy, with gusts of around 30 km/h. All in all, January is a good month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in January81February23° · Sea 24° · 7 h
In February, Marathon, Florida Keys is warm: daytime highs average 23 °C, and even at night it stays warm at around 21 °C. The sea averages 23.7 °C – pleasant for swimming. The sun shines for around 7 hours a day. Rain is rare: about 4 days bring 30 mm in total. The air is often humid and muggy. It is often windy, with gusts of around 28 km/h. All in all, February is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in February88March24° · Sea 25° · 8 h
In March, Marathon, Florida Keys is warm: daytime highs average 24 °C, and even at night it stays warm at around 22 °C. The sea averages 24.5 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain is rare: about 5 days bring 30 mm in total. The air is often humid and muggy. It is often windy, with gusts of around 29 km/h. All in all, March is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in March98April25° · Sea 26° · 9 h
In April, Marathon, Florida Keys is warm: daytime highs average 25 °C, and even at night it stays warm at around 24 °C. The sea averages 25.7 °C – pleasant for swimming. With around 9 hours of sunshine a day, there is plenty of sun. Rain falls on about 5 days, adding up to 36 mm. The air is often humid and muggy. It is often windy, with gusts of around 28 km/h. All in all, April is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in April94May27° · Sea 27° · 9 h
In May, Marathon, Florida Keys is warm: daytime highs average 27 °C, and even at night it stays warm at around 25 °C. The sea averages 27.3 °C – lovely and warm for swimming. With around 9 hours of sunshine a day, there is plenty of sun. Rain falls on about 8 days, adding up to 67 mm. The air is often humid and muggy. All in all, May is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in May82June28° · Sea 29° · 8 h
In June, Marathon, Florida Keys is hot: daytime highs average 28 °C, and even at night it stays warm at around 27 °C. The sea averages 28.8 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. It rains often – on about 14 days, adding up to 116 mm. The air is often humid and muggy. All in all, June is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in June85July29° · Sea 30° · 9 h
In July, Marathon, Florida Keys is hot: daytime highs average 29 °C, and even at night it stays warm at around 27 °C. The sea averages 29.7 °C – almost as warm as a bath. The sun shines for around 9 hours a day. It rains often – on about 14 days, adding up to 74 mm. The air is often humid and muggy. All in all, July is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in July81August29° · Sea 30° · 8 h
In August, Marathon, Florida Keys is hot: daytime highs average 29 °C, and even at night it stays warm at around 28 °C. The sea averages 30.1 °C – almost as warm as a bath. The sun shines for around 8 hours a day. It rains often – on about 16 days, adding up to 112 mm. The air is often humid and muggy. All in all, August is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in August75September29° · Sea 30° · 7 h
In September, Marathon, Florida Keys is hot: daytime highs average 29 °C, and even at night it stays warm at around 27 °C. The sea averages 29.6 °C – almost as warm as a bath. The sun shines for around 7 hours a day. It rains often – on about 17 days, adding up to 134 mm. The air is often humid and muggy. All in all, September is a good month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in September81October27° · Sea 28° · 7 h
In October, Marathon, Florida Keys is hot: daytime highs average 27 °C, and even at night it stays warm at around 26 °C. The sea averages 28.2 °C – lovely and warm for swimming. The sun shines for around 7 hours a day. Rain is frequent, with about 13 rainy days and 106 mm in total. The air is often humid and muggy. It is often windy, with gusts of around 28 km/h. All in all, October is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in October90November25° · Sea 26° · 7 h
In November, Marathon, Florida Keys is warm: daytime highs average 25 °C, and even at night it stays warm at around 23 °C. The sea averages 26.3 °C – lovely and warm for swimming. The sun shines for around 7 hours a day. Rain falls on about 6 days, adding up to 38 mm. The air is often humid and muggy. It is often windy, with gusts of around 29 km/h. All in all, November is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in November83December24° · Sea 25° · 7 h
In December, Marathon, Florida Keys is warm: daytime highs average 24 °C, and even at night it stays warm at around 22 °C. The sea averages 24.9 °C – pleasant for swimming. The sun shines for around 7 hours a day. Rain falls on about 5 days, adding up to 34 mm. The air is often humid and muggy. It is often windy, with gusts of around 29 km/h. All in all, December is an excellent month for a holiday in Marathon, Florida Keys.
Marathon, Florida Keys in DecemberMarathon, Florida Keys compared
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Marathon vs. Key West
In October the holiday weather in Marathon and Key West is about equally good (score 81 vs. 81). During the day it is about as warm in Key West as in Marathon. The sea is about equally warm.
| in October | Marathon | Key West |
|---|---|---|
| Holiday score | 81 | 81 |
| Daytime high | 27° | 27° |
| Sea | 28° | 28° |
| Sunshine | 7 h | 7 h |
| Rainy days | 13 | 12 |
| Best time | Mar – May, Jul, Nov – Dec | Mar – May, Jul, Nov |
Through the year
USA in October: the best places
In October, Marathon, Florida Keys ranks 17 among the 31 nearest destinations in this country.
- Panama City Beach25°26°90
- 2Sarasota28°27°89
- 3Clearwater Beach26°27°89
- 4Destin26°26°89
- 5Mobile26°25°87
- 6Naples29°28°86
- 7Fort Myers Beach28°28°86
- 8St. Pete Beach27°27°86
- 17MarathonThis page27°28°81
Planning a trip to Marathon, Florida Keys
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Marathon, Florida Keys in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Marathon, Florida Keys has its best school-holiday weather during the Easter holidays (score 95) and its weakest during the Christmas holidays (score 79).
- 95
Easter holidays
Mar – Apr
ExcellentBest holidays
- 25 °C by day
- Sea 25 °C
- 8.7 h of sun a day
- 5 rainy days a month
Good for: Beach & swimming, Sightseeing & walks
- 92
May half-term
May – Jun
Excellent
- 27 °C by day
- Sea 28 °C
- 8.8 h of sun a day
- 9 rainy days a month
Good for: Beach & swimming, Sightseeing & walks
- 82
Summer holidays
Jul – Aug
Excellent
- 29 °C by day
- Sea 30 °C
- 8.4 h of sun a day
- 15 rainy days a month
Keep in mind: Frequent rain, Storm season
- 81
October half-term
Oct
Excellent
- 27 °C by day
- Sea 28 °C
- 7.0 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain, Storm season
- 79
Christmas holidays
Dec – Jan
Good
- 23 °C by day
- Sea 24 °C
- 6.7 h of sun a day
- 5 rainy days a month
Good for: Sightseeing & walks
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 9 h 15 min
- Distance
- 7,250 km
- Time zone
- UTC−4
- Jet lag
- About 3 days (5 h west)
Rule of thumb for flying west: for a few days before, stay up a little later, and get afternoon and evening light at your destination.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Storm season
Marathon, Florida Keys lies in an area that Atlantic hurricanes can reach. The hurricane season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
- January
- February
- March
- April
- May
- June: Season
- July: Season
- August: Peak
- September: Peak
- October: Peak
- November: Season
- December
Official season dates of the regional warning centres (NOAA, JMA, IMD, Météo-France, BoM); not a forecast.
Frequently asked questions about Marathon, Florida Keys
When is the best time to visit Marathon, Florida Keys?
The best time to visit Marathon, Florida Keys is from March to May and in July and from November to December. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Marathon, Florida Keys?
The sea temperature in Marathon, Florida Keys ranges from 23.6 °C in January to 30.1 °C in August. At 20 °C and more, the sea is warm enough for swimming all year round.
Can you swim in Marathon, Florida Keys in October?
Yes. In October the sea averages 28.2 °C – lovely and warm for swimming.
What is the warmest month in Marathon, Florida Keys?
August is the warmest month, with average highs of 29 °C and nights around 28 °C. January is the coolest month at 22 °C.
When does it rain most in Marathon, Florida Keys?
Rain is most frequent from June to October; the wettest month is September with 134 mm. The driest month is February with 30 mm.
How many hours of sunshine does Marathon, Florida Keys get?
Marathon, Florida Keys gets around 2,820 hours of sunshine a year. The sunniest month is April with 9.0 hours a day; in January there are 6.7 hours a day.
What time zone is Marathon, Florida Keys in?
Marathon, Florida Keys uses the time zone America/New_York: UTC−5 in January and UTC−4 in July.
How long is the flight from London to Marathon, Florida Keys?
A nonstop flight from London to Marathon, Florida Keys takes about 9 h 15 min, for a straight-line distance of about 7,250 km.
When is hurricane season in Marathon, Florida Keys?
Marathon, Florida Keys lies in an area that Atlantic hurricanes can reach. The hurricane season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
Which school holidays are best for Marathon, Florida Keys?
Marathon, Florida Keys has its best school-holiday weather during the Easter holidays (score 95) and its weakest during the Christmas holidays (score 79). Holiday ratings (0–100): Easter holidays 95, May half-term 92, Summer holidays 82, October half-term 81, Christmas holidays 79.
Near Marathon, Florida Keys
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Destinations whose weather through the year is closest to Marathon, Florida Keys's – good alternatives.