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  3. Watertown
  4. September

Watertown, SD Climate in September

Temperature for September

In Watertown, SD during September the average high temperature is 72.7°F. The hottest day on record was September 7, 1976 when the temperature hit 99.9°F.

Watertown, SD daily average and extreme temperature range for September

Low Temperature

During September the overnight temperature drops to an average of 48.4°F, with the lowest temperature of 23.0°F being recorded on September 23, 1983. Overnight temperatures drop below freezing between 1 and 7 times in September.

Precipitation for September

In September the average monthly rainfall in Watertown, SD is 1.81 inches with rain usually falling on between 7 and 8 days. 1949 was the driest September with only 0.00 inches of rain falling, and 2010 was the wettest September with 6.58 inches of rain. The wettest single day in September was 2 September 2006 when 3.16 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.

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