Marathon, Florida Keys weather in October
Temperature, sea and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Excellent
Best time to visit: March – May, July, November – December
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.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 75 | 81 | 90 |
| Day | 29° | 27° | 25° |
| Night | 27° | 26° | 23° |
| Sea | 30° | 28° | 26° |
| Sun | 7 h | 7 h | 7 h |
| Rain days | 17 | 13 | 6 |
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
Marathon, Florida Keys in October: quick answers
Is Marathon, Florida Keys hot in October?
Yes. In October, Marathon, Florida Keys is hot: daytime highs average 27 °C and nights stay around 26 °C.
Can you swim in Marathon, Florida Keys in October?
Yes. In October the sea averages 28.2 °C – lovely and warm for swimming.
Does it rain much in Marathon, Florida Keys in October?
Rain is frequent, with about 13 rainy days and 106 mm in total.
Marathon, Florida Keys month by month
The whole year in Marathon, Florida KeysAll destinations: USAFlorida weather in OctoberWhere to go in OctoberSea temperature in October
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