Key West weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: March – July, October – December
What is the weather like in Key West in May?
In May, Key West is warm: daytime highs average 27 °C, and even at night it stays warm at around 25 °C. The sea averages 27.0 °C – lovely and warm for swimming. With around 10 hours of sunshine a day, there is plenty of sun. Rain falls on about 8 days, adding up to 63 mm. The air is often humid and muggy. All in all, May is an excellent month for a holiday in Key West.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 13 h 19 min06:44 – 20:03
- UV index
- 12 · extremeclear sky, noon (estimate)
- Muggy days
- 29 daysdew point 18 °C or more
- Wind
- 26 km/haverage daily peak
- Cloud cover
- 37 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %74 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in May
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
Key West in May: quick answers
Is Key West hot in May?
Warm rather than hot: in May, daytime highs in Key West average 27 °C and nights cool to about 25 °C.
Can you swim in Key West in May?
Yes. In May the sea averages 27.0 °C – lovely and warm for swimming.
Does it rain much in Key West in May?
Rain falls on about 8 days, adding up to 63 mm.
Key West month by month
The whole year in Key WestAll destinations: USA
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)