AI-generatedKey Largo, Florida Keys at a glance
- Best time
- Oct – May
- Warmest month
- Aug · 31°
- Warmest sea
- Aug · 30.1°
- Sunshine a year
- 2,640 h
- Rain a year
- 904 mm
- Climate
- Subtropical
- Time zone
- UTC−5 / UTC−4
- Elevation
- 2 m
Climate in Key Largo, Florida Keys
Key Largo, Florida Keys has a subtropical climate with warm summers and mild winters. August is the warmest month with average highs of 31 °C, while January is the coolest at 23 °C. With around 2,640 hours of sunshine a year, Key Largo, Florida Keys is sunny; April is the sunniest month with 8.4 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Excellent
Best time to visit: October – May
October is the peak of the hurricane season
Good forBeach & swimming
Keep in mindStorm season
A typical day in October
- Morning, 08:00: about 25°
- Midday, 13:00: about 28°
- Afternoon, 16:00: about 28°
- Evening, 20:00: about 26°
- Night, 23:00: about 25°
07:1918:56
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 07:05–07:50 · evening 18:25–19:10
- Blue hour
- Morning 06:56–07:05 · evening 19:10–19:19
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 Key Largo, Florida Keys in October?
In October, Key Largo, Florida Keys is hot: daytime highs average 28 °C, and even at night it stays warm at around 24 °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 12 rainy days and 90 mm in total. The air is often humid and muggy. All in all, October is an excellent month for a holiday in Key Largo, Florida Keys.
More details for October
- Daylight
- 11 h 36 min07:19 – 18:56
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 27 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 51 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %58 %
- Few rainy daysweight 20 %46 %
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
Sea temperature in Key Largo, Florida Keys
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 27.5 – 28.8 °C
Swimming season: All year
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Key Largo, Florida Keys ranges from 24.0 °C in January to 30.1 °C in August. At 20 °C and more, the sea is warm enough for swimming all year round.
From November to January the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 29.3 and 30.7 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 24.0° | 23.2° | 24.9° | pleasant |
| FebruaryFeb | 24.1° | 23.0° | 25.0° | pleasant |
| MarchMar | 24.7° | 23.8° | 25.5° | pleasant |
| AprilApr | 25.8° | 24.9° | 26.6° | pleasant |
| MayMay | 27.3° | 26.6° | 27.9° | warm |
| JuneJun | 28.7° | 28.1° | 29.3° | warm |
| JulyJul | 29.6° | 28.9° | 30.2° | very warm |
| AugustAug | 30.1° | 29.3° | 30.7° | very warm |
| SeptemberSep | 29.5° | 28.8° | 30.2° | very warm |
| OctoberOct | 28.2° | 27.5° | 28.8° | warm |
| NovemberNov | 26.4° | 25.7° | 27.1° | warm |
| DecemberDec | 25.2° | 24.2° | 25.8° | pleasant |
Sunshine hours in Key Largo, 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 6.5 of 11.6 hours of daylight in Key Largo, Florida Keys, 56 % 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 Key Largo, 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 Key Largo, 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, Key Largo, Florida Keys has about 12 rainy days with 90 mm of rain in total.
Wind and clouds in Key Largo, Florida Keys
How breezy and how cloudy Key Largo, 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 Key Largo, Florida Keys typically peaks at 22 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: Oct – May.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 51 % of the sky over Key Largo, Florida Keys: variable cloud, with about 6.5 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 Key Largo, Florida Keys
How often the day gets hot in Key Largo, 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, Key Largo, Florida Keys has about 3 hot days, with an average daytime high of 28 °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 Key Largo, Florida Keys
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Pleasant 15–20°
- Warm 20–24°
- Hot 24° and more
- muggy month (10+ muggy days)
HotOctober: nights around 24°. Hot nights: air conditioning makes sleeping much easier. Muggy on about 27 days (dew point 18 °C or more).
The coolest nights are in January (18°), the warmest in August (26°). Tropical nights of 20 °C and more are the rule from March to November; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) from December to February. It is muggy (dew point 18 °C or more) on about 266 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 | 81 | 23° | 18° | 24.0° | 6.5 h | 5 | 28 |
| FebruaryFeb | 89 | 25° | 19° | 24.1° | 6.8 h | 4 | 29 |
| MarchMar | 94 | 26° | 20° | 24.7° | 7.5 h | 5 | 32 |
| AprilApr | 95 | 27° | 22° | 25.8° | 8.4 h | 6 | 38 |
| MayMay | 89 | 29° | 24° | 27.3° | 8.4 h | 10 | 77 |
| JuneJun | 75 | 30° | 25° | 28.7° | 7.4 h | 19 | 150 |
| JulyJul | 77 | 30° | 26° | 29.6° | 8.1 h | 20 | 103 |
| AugustAug | 76 | 31° | 26° | 30.1° | 7.8 h | 21 | 137 |
| SeptemberSep | 72 | 30° | 26° | 29.5° | 6.7 h | 20 | 151 |
| OctoberOct | 81 | 28° | 24° | 28.2° | 6.5 h | 12 | 90 |
| NovemberNov | 90 | 26° | 21° | 26.4° | 6.3 h | 5 | 35 |
| DecemberDec | 87 | 25° | 19° | 25.2° | 6.3 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
25.09° N, 80.45° W · 2 m · America/New_York
Best time to visit Key Largo, Florida Keys
The best time to visit Key Largo, Florida Keys is from October to May. For a beach holiday with the sea above 21 °C, go from October to May. For sightseeing, day trips and hiking, conditions are most comfortable from November to April. Rain is most frequent from June to September; the wettest month is September with 151 mm.
Key Largo, Florida Keys through the seasons
How the weather changes over the seasons, with averages for each.
Key Largo, Florida Keys in spring
Mar – May
Excellent
- 26–29 °C by day
- Sea 26 °C
- 8 h of sun a day
- 21 rainy days in all
Key Largo, Florida Keys in summer
Jun – Aug
Good
- 30–31 °C by day
- Sea 30 °C
- 8 h of sun a day
- 60 rainy days in all
Key Largo, Florida Keys in autumn
Sep – Nov
Excellent
- 26–30 °C by day
- Sea 28 °C
- 7 h of sun a day
- 37 rainy days in all
Key Largo, Florida Keys in winter
Dec – Feb
Excellent
- 23–25 °C by day
- Sea 24 °C
- 7 h of sun a day
- 14 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Key Largo, Florida Keys for you.
Your best months: April – May, November
Based on the climate averages; tap a month to see its details.
Compare two months in Key Largo, 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 Key Largo, Florida Keys: score 95 against 81. In April, days are 1 °C cooler than in October. The sea is 2 °C cooler in April. April has 6 fewer rainy days. The sun shines 2 hours longer a day in April.
| Month | October | April |
|---|---|---|
| Weather score | 81 | 95better |
| Day high | 28° | 27° |
| Night low | 24° | 22° |
| Sea | 28.2° | 25.8° |
| Sunshine | 6.5 h | 8.4 hbetter |
| Rainy days | 12 | 6better |
| Rainfall | 90 mm | 38 mmbetter |
| Muggy days | 27 | 17better |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Oct – May
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Nov – Apr
15–28 °C and not too much rain
Rainy months
Jun – Sep
12 or more rainy days
Key Largo, Florida Keys month by month
The typical weather for every month at a glance.
81January23° · Sea 24° · 7 h
In January, Key Largo, Florida Keys is warm: daytime highs average 23 °C, and nights cool down to about 18 °C. The sea averages 24.0 °C – pleasant for swimming. The sun shines for around 7 hours a day. Rain falls on about 5 days, adding up to 28 mm. All in all, January is an excellent month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in January89February25° · Sea 24° · 7 h
In February, Key Largo, Florida Keys is warm: daytime highs average 25 °C, and nights cool down to about 19 °C. The sea averages 24.1 °C – pleasant for swimming. The sun shines for around 7 hours a day. Rain is rare: about 4 days bring 29 mm in total. All in all, February is an excellent month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in February94March26° · Sea 25° · 8 h
In March, Key Largo, Florida Keys is warm: daytime highs average 26 °C, and nights cool down to about 20 °C. The sea averages 24.7 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain falls on about 5 days, adding up to 32 mm. All in all, March is an excellent month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in March95April27° · Sea 26° · 8 h
In April, Key Largo, Florida Keys is hot: daytime highs average 27 °C, and even at night it stays warm at around 22 °C. The sea averages 25.8 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain falls on about 6 days, adding up to 38 mm. The air is often humid and muggy. All in all, April is an excellent month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in April89May29° · Sea 27° · 8 h
In May, Key Largo, Florida Keys is hot: daytime highs average 29 °C, and even at night it stays warm at around 24 °C. The sea averages 27.3 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. Rain is frequent, with about 10 rainy days and 77 mm in total. On about 6 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, May is an excellent month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in May75June30° · Sea 29° · 7 h
In June, Key Largo, Florida Keys is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 28.7 °C – lovely and warm for swimming. The sun shines for around 7 hours a day. It rains often – on about 19 days, adding up to 150 mm. On about 12 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, June is a good month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in June77July30° · Sea 30° · 8 h
In July, Key Largo, Florida Keys is hot: daytime highs average 30 °C, and even at night it stays warm at around 26 °C. The sea averages 29.6 °C – almost as warm as a bath. The sun shines for around 8 hours a day. It rains often – on about 20 days, adding up to 103 mm. On about 22 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, July is a good month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in July76August31° · Sea 30° · 8 h
In August, Key Largo, Florida Keys is hot: daytime highs average 31 °C, and even at night it stays warm at around 26 °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 21 days, adding up to 137 mm. On about 23 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a good month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in August72September30° · Sea 30° · 7 h
In September, Key Largo, Florida Keys is hot: daytime highs average 30 °C, and even at night it stays warm at around 26 °C. The sea averages 29.5 °C – almost as warm as a bath. The sun shines for around 7 hours a day. It rains often – on about 20 days, adding up to 151 mm. On about 14 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a good month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in September81October28° · Sea 28° · 7 h
In October, Key Largo, Florida Keys is hot: daytime highs average 28 °C, and even at night it stays warm at around 24 °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 12 rainy days and 90 mm in total. The air is often humid and muggy. All in all, October is an excellent month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in October90November26° · Sea 26° · 6 h
In November, Key Largo, Florida Keys is warm: daytime highs average 26 °C, and even at night it stays warm at around 21 °C. The sea averages 26.4 °C – lovely and warm for swimming. Expect around 6 hours of sunshine a day. Rain falls on about 5 days, adding up to 35 mm. The air is often humid and muggy. All in all, November is an excellent month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in November87December25° · Sea 25° · 6 h
In December, Key Largo, Florida Keys is warm: daytime highs average 25 °C, and nights cool down to about 19 °C. The sea averages 25.2 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain falls on about 5 days, adding up to 34 mm. The air is often humid and muggy. All in all, December is an excellent month for a holiday in Key Largo, Florida Keys.
Key Largo, Florida Keys in DecemberKey Largo, Florida Keys compared
Put Key Largo, Florida Keys side by side with another destination.
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Key Largo vs. Marathon
In October the holiday weather in Key Largo and Marathon is about equally good (score 81 vs. 81). During the day Marathon is 1 °C cooler than Key Largo. The sea is about equally warm.
| in October | Key Largo | Marathon |
|---|---|---|
| Holiday score | 81 | 81 |
| Daytime high | 28° | 27° |
| Sea | 28° | 28° |
| Sunshine | 7 h | 7 h |
| Rainy days | 12 | 13 |
| Best time | Oct – May | Mar – May, Jul, Nov – Dec |
Through the year
USA in October: the best places
In October, Key Largo, 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
- 17Key LargoThis page28°28°81
Planning a trip to Key Largo, Florida Keys
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Key Largo, 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.
Key Largo, Florida Keys has its best school-holiday weather during the Easter holidays (score 95) and its weakest during the summer holidays (score 76).
- 95
Easter holidays
Mar – Apr
ExcellentBest holidays
- 27 °C by day
- Sea 25 °C
- 8.1 h of sun a day
- 6 rainy days a month
Good for: Beach & swimming, Sightseeing & walks
- 86
May half-term
May – Jun
Excellent
- 29 °C by day
- Sea 28 °C
- 8.2 h of sun a day
- 12 rainy days a month
Good for: Beach & swimming
- 76
Summer holidays
Jul – Aug
Good
- 31 °C by day
- Sea 30 °C
- 7.9 h of sun a day
- 21 rainy days a month
Keep in mind: Frequent rain, Storm season
- 81
October half-term
Oct
Excellent
- 28 °C by day
- Sea 28 °C
- 6.5 h of sun a day
- 12 rainy days a month
Good for: Beach & swimming
Keep in mind: Storm season
- 84
Christmas holidays
Dec – Jan
Excellent
- 24 °C by day
- Sea 25 °C
- 6.4 h of sun a day
- 5 rainy days a month
Good for: Beach & swimming, Sightseeing & walks
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 9 h 10 min
- Distance
- 7,180 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
Key Largo, 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 Key Largo, Florida Keys
When is the best time to visit Key Largo, Florida Keys?
The best time to visit Key Largo, Florida Keys is from October to May. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Key Largo, Florida Keys?
The sea temperature in Key Largo, Florida Keys ranges from 24.0 °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 Key Largo, Florida Keys in October?
Yes. In October the sea averages 28.2 °C – lovely and warm for swimming.
What is the warmest month in Key Largo, Florida Keys?
August is the warmest month, with average highs of 31 °C and nights around 26 °C. January is the coolest month at 23 °C.
When does it rain most in Key Largo, Florida Keys?
Rain is most frequent from June to September; the wettest month is September with 151 mm. The driest month is January with 28 mm.
How many hours of sunshine does Key Largo, Florida Keys get?
Key Largo, Florida Keys gets around 2,640 hours of sunshine a year. The sunniest month is April with 8.4 hours a day; in November there are 6.3 hours a day.
What time zone is Key Largo, Florida Keys in?
Key Largo, 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 Key Largo, Florida Keys?
A nonstop flight from London to Key Largo, Florida Keys takes about 9 h 10 min, for a straight-line distance of about 7,180 km.
When is hurricane season in Key Largo, Florida Keys?
Key Largo, 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 Key Largo, Florida Keys?
Key Largo, Florida Keys has its best school-holiday weather during the Easter holidays (score 95) and its weakest during the summer holidays (score 76). Holiday ratings (0–100): Easter holidays 95, May half-term 86, Summer holidays 76, October half-term 81, Christmas holidays 84.
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