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Watertown September Weather

Averages and records for weather in Watertown, Wisconsin in the month of September.

Typical Watertown September Weather 1991–2020
Average daily high	73.1 °F
Average daily low	51.0 °F
Average monthly precipitation	3.5 inches
Average monthly snow	none
Daily chance of precipitation	33.3%
Daily chance of snow	0%

Watertown September Weather Records 1893–2024
Highest temperature	100 °F	September 15, 1939
Lowest temperature	20 °F	September 30, 1899
Highest daily low	76 °F	September 2, 1926
Lowest daily high	42 °F	September 26, 1942
Hottest average high temperature	80.9 °F	1939
Coldest average high temperature	65.5 °F	1924
Most daily precipitation	5.3 inches	September 12, 2022
Most monthly precipitation	13.5 inches	1965
Most daily snow	0.5 inches	September 26, 1942
Most monthly snow	0.5 inches	1942

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
September 1	77.5	56.3	99	36
September 2	77.3	56.0	98	30
September 3	77.1	55.8	95	34
September 4	77.0	55.5	95	36
September 5	76.8	55.2	93	37
September 6	76.6	55.0	98	36
September 7	76.3	54.7	100	37
September 8	76.0	54.3	98	39
September 9	75.6	53.8	96	38
September 10	75.2	53.4	95	33
September 11	74.8	52.9	94	32
September 12	74.5	52.5	92	33
September 13	74.2	52.1	97	33
September 14	73.8	51.7	100	31
September 15	73.3	51.2	100	33
September 16	72.9	50.8	92	31
September 17	72.5	50.4	90	29
September 18	72.1	50.0	92	31
September 19	71.6	49.6	93	30
September 20	71.3	49.3	91	29
September 21	70.7	48.8	90	33
September 22	70.2	48.4	93	28
September 23	69.9	48.0	94	29
September 24	69.6	47.7	92	24
September 25	69.3	47.3	91	23
September 26	69.0	46.9	90	20
September 27	68.6	46.6	88	20
September 28	68.2	46.2	88	20
September 29	67.8	45.8	92	22
September 30	67.4	45.4	89	20

Weather Station Details

Years	Station	Coordinates
1893–2024	Watertown WWTP	location