Key West Weather in May
May's weather gets noticeably hotter and slightly wetter than earlier in spring at Key West, Florida. Yet the days remain among the sunniest and least humid of the year.
This page gives detailed information on the typical May temperature, precipitation, sun, humidity, wind and storms for Key West. The numbers here are historical averages based on climate data gathered at the Key West International Airport, located on Key West Island.
Temperature
| 86 °F | May average high | 30 °C |
| 76 °F | May average low | 25 °C |
| 30 days | 80 °F max. or more (27 °C) |
| 2 days | 70 °F min. or less (21 °C) |
May temperatures at Key West are consistently in the 80s degrees Fahrenheit (over 26 degrees Celsius) during the day. At night the thermometer seldom drops below 70 °F (21 °C).
Most years, the vacation island does not experience days in May as hot as 90 °F (32 °C). And nights here are not expected to get down to 60 °F (16 °C)
Rain
| 3.1 in | total precipitation | 79 mm |
| 8 days | of rain |
Half the time, Key West receives 1.0 to 4.1 inches (26 to 104 mm) of rainfall in May. One in four years has drier weather, while another one in four is wetter.
Sun
| 82 % | sunshine |
| 10 days | clear skies |
The sun's rays reach the ground in Key West during 82 percent of daylight hours on average in May, for a total of 339 hours in the month. Typically on 10 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in May at Key West lasts for 13 hours and 20 minutes a day on average. The shortest day of the month is the 1st with 13 hours and 5 minutes of daylight. By the end of the month, the days have lengthened to 13:33 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 72 % | May average humidity |
The relative humidity in Key West during May usually peaks at 77 percent in the morning then drops to 65 percent by early afternoon.
| Local Time | 1 am | 4 am | 7 am | 10 am | 1 pm | 4 pm | 7 pm | 10 pm | Humidity % | 76 | 77 | 76 | 68 | 65 | 65 | 71 | 75 |
Wind
| 10.5 mph | May wind speed average | 16.9 kph |
May is a little less windy than most other months in Key West.
Storms
| 2 days | rainfall of 0.5 inches (13 mm) or more |
| 5 days | with thunderstorms in May |
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.