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Belleville August Weather

Averages and records for weather in Belleville, Illinois in the month of August.

Typical Belleville August Weather 1991–2020
Average daily high	88.7 °F
Average daily low	65.4 °F
Average monthly precipitation	3.9 inches
Average monthly snow	none
Daily chance of precipitation	23.1%
Daily chance of snow	0%

Belleville August Weather Records 1948–2024
Highest temperature	105 °F	August 16, 2007
Lowest temperature	39 °F	August 29, 1986
Highest daily low	84 °F	August 15, 1988
Lowest daily high	61 °F	August 18, 1963
Hottest average high temperature	96.4 °F	2007
Coldest average high temperature	80.5 °F	1950
Most daily precipitation	4.0 inches	August 12, 2020
Most monthly precipitation	10.4 inches	2020
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	89.3	66.9	100	50
August 2	89.2	66.8	100	53
August 3	89.1	66.7	104	51
August 4	89.1	66.5	101	49
August 5	89.0	66.4	100	52
August 6	88.9	66.2	99	50
August 7	88.8	66.1	100	46
August 8	88.8	66.0	101	46
August 9	88.8	65.9	101	46
August 10	88.7	65.7	100	46
August 11	88.7	65.6	100	47
August 12	88.7	65.5	101	45
August 13	88.7	65.5	101	46
August 14	88.8	65.5	100	46
August 15	88.8	65.5	105	46
August 16	88.8	65.4	105	48
August 17	88.7	65.4	100	52
August 18	88.5	65.3	101	50
August 19	88.4	65.1	103	51
August 20	88.3	65.0	103	48
August 21	88.3	64.9	101	46
August 22	88.2	64.7	100	50
August 23	88.2	64.5	100	51
August 24	88.0	64.3	100	50
August 25	87.9	64.1	98	50
August 26	87.7	63.9	99	50
August 27	87.6	63.7	99	49
August 28	87.5	63.5	100	43
August 29	87.4	63.3	99	39
August 30	87.3	63.1	98	41
August 31	87.2	62.9	99	44

Weather Station Details

Years	Station	Coordinates
1948–2024	Belleville SIU Research	location