Key West, FL Climate in September

Temperature for September

In Key West, FL during September the average high temperature is 88.6°F. The hottest day on record was September 14, 1980 when the temperature hit 102.9°F.

Key West, FL daily average and extreme temperature range for September

Low Temperature

During September the overnight temperature drops to an average of 78.1°F, with the lowest temperature of 69.1°F being recorded on September 18, 1985. In September it has never frozen overnight.

Precipitation for September

In September the average monthly rainfall in Key West, FL is 6.17 inches with rain usually falling on between 15 and 16 days. 1983 was the driest September with only 2.49 inches of rain falling, and 1994 was the wettest September with 12.80 inches of rain. The wettest single day in September was 30 September 1994 when 5.74 inches of rain fell.

In September it usually snows on between 0 and 1 days. Tornados are reported on 1 and 2 days in September. There are thunderstorms on between 9 and 10 days in September.