Watertown Average Temperature by Month

This page shows the average temperature in each month of the year in Watertown, South Dakota. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Watertown?
In Watertown, South Dakota, the warmest month is July, with an average daily high temperature of 82.1 °F and an average low of 60.1 °F.
What's the Coldest Month in Watertown?
In Watertown, South Dakota, the coolest month is January, with an average daily high temperature of 21.6 °F and an average low of 3.3 °F.
Month Avg. High Avg. Low
January 21.6 °F 3.3 °F
February 26.1 °F 6.9 °F
March 38.9 °F 19.7 °F
April 54.4 °F 31.8 °F
May 67.3 °F 44.7 °F
June 77.0 °F 55.5 °F
July 82.1 °F 60.1 °F
August 79.8 °F 57.7 °F
September 71.8 °F 48.7 °F
October 56.5 °F 35.4 °F
November 39.9 °F 21.5 °F
December 26.5 °F 9.5 °F
Year 53.7 °F 33.2 °F
Weather Station Details
Years Station Coordinates
1893–2024 Watertown Regional Airport location
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