Watertown September Weather

Averages and records for weather in Watertown, South Dakota in the month of September.
Typical Watertown September Weather
1991–2020
Average daily high 71.8 °F
Average daily low 48.7 °F
Average monthly precipitation 2.5 inches
Average monthly snow 0.0 inches
Daily chance of precipitation 28.2%
Daily chance of snow 0.13%
Watertown September Weather Records
1893–2024
Highest temperature 104 °F September 10, 1931
Lowest temperature 9 °F September 29, 1899
Highest daily low 77 °F September 7, 1931
Lowest daily high 37 °F September 30, 1961
Hottest average high temperature 81.3 °F 1931
Coldest average high temperature 57.3 °F 1965
Most daily precipitation 2.9 inches September 24, 1934
Most monthly precipitation 7.2 inches 1921
Most daily snow 1.2 inches September 26, 1942
Most monthly snow 1.2 inches 1942
Note: Daily averages are a moving average which includes 14 days before and after
Day Average (°F) Record (°F)
High Low High Low
September 1 77.1 54.5 93 34
September 2 76.9 54.2 98 36
September 3 76.7 54.0 101 30
September 4 76.4 53.8 101 32
September 5 76.0 53.5 99 33
September 6 75.7 53.1 101 32
September 7 75.2 52.7 101 34
September 8 74.7 52.2 98 30
September 9 74.2 51.7 103 27
September 10 73.8 51.3 104 26
September 11 73.4 50.8 96 25
September 12 73.1 50.3 96 24
September 13 72.6 49.9 96 25
September 14 72.2 49.3 96 32
September 15 71.9 48.9 96 29
September 16 71.6 48.4 90 25
September 17 71.2 47.9 93 24
September 18 70.7 47.5 92 23
September 19 70.1 47.0 93 24
September 20 69.5 46.4 91 20
September 21 68.9 46.1 97 23
September 22 68.4 45.7 99 21
September 23 68.1 45.3 95 23
September 24 67.7 44.9 91 24
September 25 67.3 44.4 87 21
September 26 66.9 43.9 91 20
September 27 66.5 43.6 93 20
September 28 66.0 43.1 88 19
September 29 65.5 42.7 87 9
September 30 65.0 42.2 87 20
Weather Station Details
Years Station Coordinates
1893–2024 Watertown Regional Airport location