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Oconomowoc September Weather

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

Typical Oconomowoc September Weather 1991–2020
Average daily high	73.5 °F
Average daily low	51.6 °F
Average monthly precipitation	3.4 inches
Average monthly snow	none
Daily chance of precipitation	31.7%
Daily chance of snow	0%

Oconomowoc September Weather Records 1893–2024
Highest temperature	98 °F	September 1, 1953
Lowest temperature	26 °F	September 29, 1949
Highest daily low	75 °F	September 3, 2011
Lowest daily high	46 °F	September 29, 1967
Hottest average high temperature	79.2 °F	2005
Coldest average high temperature	65.3 °F	1993
Most daily precipitation	5.0 inches	September 12, 2022
Most monthly precipitation	10.9 inches	1986
Most daily snow	none	-
Most monthly snow	none	-

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	77.9	56.9	98	39
September 2	77.6	56.6	96	37
September 3	77.5	56.3	96	42
September 4	77.4	56.0	93	37
September 5	77.1	55.8	92	37
September 6	76.9	55.5	92	37
September 7	76.6	55.2	95	36
September 8	76.3	54.8	94	39
September 9	75.9	54.4	94	38
September 10	75.5	53.9	91	39
September 11	75.2	53.5	95	37
September 12	74.8	53.1	91	35
September 13	74.5	52.7	89	34
September 14	74.1	52.3	90	35
September 15	73.7	51.8	86	33
September 16	73.3	51.4	90	33
September 17	72.9	51.0	88	36
September 18	72.5	50.6	89	35
September 19	72.0	50.2	91	33
September 20	71.6	49.8	91	29
September 21	71.1	49.4	89	33
September 22	70.6	48.9	89	28
September 23	70.2	48.5	93	27
September 24	69.9	48.2	92	28
September 25	69.7	47.8	90	31
September 26	69.4	47.4	91	29
September 27	69.0	46.9	88	31
September 28	68.6	46.5	86	27
September 29	68.2	46.1	91	26
September 30	67.8	45.7	85	29

Weather Station Details

Years	Station	Coordinates
1893–2024	Oconomowoc WWTP	location