Hartford, CT Climate in September

Temperature for September

In Hartford, CT during September the average high temperature is 74.9°F. The hottest day on record was September 11, 1983 when the temperature hit 96.1°F.

Hartford, CT daily average and extreme temperature range for September

Low Temperature

During September the overnight temperature drops to an average of 56.5°F, with the lowest temperature of 37.9°F being recorded on September 16, 1984. In September it has never frozen overnight.

Precipitation for September

In September the average monthly rainfall in Hartford, CT is 1.61 inches with rain usually falling on between 5 and 6 days. 1981 was the driest September with only 0.00 inches of rain falling, and 2008 was the wettest September with 11.88 inches of rain. The wettest single day in September was 17 September 1999 when 4.58 inches of rain fell.

In September there have been some years when thunderstorms have occurred, although there are other years when there hasn't been a thunderstorm in September.