Marathon, Florida Keys weather in March
Temperature, sea and sunshine in March: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in March
Excellent
Best time to visit: March – May, July, November – December
What is the weather like in Marathon, Florida Keys in March?
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.
March compared
How the weather changes from February to April. Tap a month to open it.
| FebruaryFeb | MarchMar | AprilApr | |
|---|---|---|---|
| Score | 81 | 88 | 98 |
| Day | 23° | 24° | 25° |
| Night | 21° | 22° | 24° |
| Sea | 24° | 25° | 26° |
| Sun | 7 h | 8 h | 9 h |
| Rain days | 4 | 5 | 5 |
More details for March
- Daylight
- 11 h 58 min07:35 – 19:33
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 17 daysdew point 18 °C or moreAll months
- Wind
- 29 km/haverage daily peakAll months
- Cloud cover
- 35 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %78 %
- Seaweight 25 %100 %
- Sunshineweight 20 %83 %
- Few rainy daysweight 20 %94 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in March
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Insect repellent
- Windproof jacket
Marathon, Florida Keys in March: quick answers
Is Marathon, Florida Keys hot in March?
Warm rather than hot: in March, daytime highs in Marathon, Florida Keys average 24 °C and nights cool to about 22 °C.
Can you swim in Marathon, Florida Keys in March?
Yes. In March the sea averages 24.5 °C – pleasant for swimming.
Does it rain much in Marathon, Florida Keys in March?
Rain is rare: about 5 days bring 30 mm in total.
Marathon, Florida Keys month by month
The whole year in Marathon, Florida KeysAll destinations: USAFlorida weather in MarchWhere to go in MarchSea temperature in March
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