Temperature for May
In Key West, FL during May the average high temperature is 85.4°F. The hottest day on record was May 11, 1996 when the temperature hit 98.1°F.
Precipitation for May
In May the average monthly rainfall in Key West, FL is 3.81 inches with rain usually falling on between 8 and 9 days. 2011 was the driest May with only 0.14 inches of rain falling, and 1978 was the wettest May with 24.05 inches of rain. The wettest single day in May was 19 May 1978 when 13.27 inches of rain fell.
Tornados are reported on 1 and 2 days in May. There are thunderstorms on between 3 and 4 days in May.