< Previous Month Next Month >

Janesville August Weather

Averages and records for weather in Janesville, Wisconsin in the month of August.

Typical Janesville August Weather 1991–2020
Average daily high	81.8 °F
Average daily low	59.4 °F
Average monthly precipitation	4.3 inches
Average monthly snow	none
Daily chance of precipitation	32.8%
Daily chance of snow	0%

Janesville August Weather Records 1893–2024
Highest temperature	102 °F	August 1, 1988
Lowest temperature	40 °F	August 28, 1986
Highest daily low	79 °F	August 27, 1973
Lowest daily high	58 °F	August 11, 1994
Hottest average high temperature	91.3 °F	1947
Coldest average high temperature	76.1 °F	1992
Most daily precipitation	4.2 inches	August 5, 2007
Most monthly precipitation	17.4 inches	2007
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
August 1	82.9	61.0	102	47
August 2	82.8	60.8	98	51
August 3	82.7	60.6	100	44
August 4	82.6	60.5	98	45
August 5	82.4	60.3	96	46
August 6	82.3	60.1	99	44
August 7	82.2	60.0	97	45
August 8	82.2	60.0	99	48
August 9	82.1	59.9	95	47
August 10	82.1	59.8	96	49
August 11	82.0	59.7	94	46
August 12	82.0	59.7	95	44
August 13	82.0	59.6	98	45
August 14	82.1	59.6	95	45
August 15	82.0	59.5	95	46
August 16	81.9	59.4	100	43
August 17	81.7	59.2	101	45
August 18	81.5	59.0	98	45
August 19	81.4	58.8	100	48
August 20	81.4	58.7	98	41
August 21	81.3	58.6	99	41
August 22	81.3	58.4	99	46
August 23	81.2	58.1	97	47
August 24	81.1	58.0	100	44
August 25	81.0	57.8	97	43
August 26	80.7	57.6	97	44
August 27	80.6	57.3	98	43
August 28	80.4	57.1	96	40
August 29	80.3	56.8	96	42
August 30	80.1	56.6	98	40
August 31	79.9	56.3	100	41

Weather Station Details

Years	Station	Coordinates
1987–2024	Afton-Janesville WWTP	location
1893–1987	Janesville	location