Portland, ME Climate in September

Temperature for September

In Portland, ME during September the average high temperature is 71.7°F. The hottest day on record was September 11, 1983 when the temperature hit 95.0°F.

Portland, ME daily average and extreme temperature range for September

Low Temperature

During September the overnight temperature drops to an average of 49.5°F, with the lowest temperature of 28.9°F being recorded on September 21, 1979. Overnight temperatures drop below freezing between 1 and 3 times in September.

Precipitation for September

In September the average monthly rainfall in Portland, ME is 4.71 inches with rain usually falling on between 10 and 11 days. 1978 was the driest September with only 0.85 inches of rain falling, and 1992 was the wettest September with 37.78 inches of rain. The wettest single day in September was 4 September 1992 when 12.28 inches of rain fell.

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