Marathon, Florida Keys weather in April
Temperature, sea and sunshine in April: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in April
Excellent
Best time to visit: March – May, July, November – December
What is the weather like in Marathon, Florida Keys in April?
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.
April compared
How the weather changes from March to May. Tap a month to open it.
More details for April
- Daylight
- 12 h 43 min07:03 – 19:46
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 21 daysdew point 18 °C or moreAll months
- Wind
- 28 km/haverage daily peakAll months
- Cloud cover
- 34 %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 %100 %
- Few rainy daysweight 20 %92 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in April
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Windproof jacket
Marathon, Florida Keys in April: quick answers
Is Marathon, Florida Keys hot in April?
Warm rather than hot: in April, daytime highs in Marathon, Florida Keys average 25 °C and nights cool to about 24 °C.
Can you swim in Marathon, Florida Keys in April?
Yes. In April the sea averages 25.7 °C – pleasant for swimming.
Does it rain much in Marathon, Florida Keys in April?
Rain falls on about 5 days, adding up to 36 mm.
Marathon, Florida Keys month by month
The whole year in Marathon, Florida KeysAll destinations: USAFlorida weather in AprilWhere to go in AprilSea temperature in April
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