Temperature for July
In Watertown, SD during July the average high temperature is 84.3°F. The hottest day on record was July 10, 1976 when the temperature hit 102.9°F.

In Watertown, SD during July the average high temperature is 84.3°F. The hottest day on record was July 10, 1976 when the temperature hit 102.9°F.
In July the average monthly rainfall in Watertown, SD is 2.20 inches with rain usually falling on between 8 and 9 days. 1949 was the driest July with only 0.00 inches of rain falling, and 1986 was the wettest July with 5.61 inches of rain. The wettest single day in July was 18 July 1985 when 2.20 inches of rain fell.
There are thunderstorms on between 5 and 6 days in July.