Washington, DC Climate in September

Temperature for September

In Washington, DC during September the average high temperature is 80.7°F. The hottest day on record was September 2, 1953 when the temperature hit 101.3°F.

Washington, DC daily average and extreme temperature range for September

Low Temperature

During September the overnight temperature drops to an average of 62.3°F, with the lowest temperature of 39.4°F being recorded on September 27, 1940. In September it has never frozen overnight.

Precipitation for September

In September the average monthly rainfall in Washington, DC is 2.18 inches with rain usually falling on between 9 and 10 days. 1937 was the driest September with only 0.00 inches of rain falling, and 1975 was the wettest September with 10.29 inches of rain. The wettest single day in September was 27 September 1985 when 3.96 inches of rain fell.

In September it usually snows on between 0 and 1 days. Tornados are reported on 0 and 1 days in September. There are thunderstorms on between 2 and 3 days in September.