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Charleston September Weather

Averages and records for weather in Charleston, Illinois in the month of September.

Typical Charleston September Weather 1991–2020
Average daily high	80.1 °F
Average daily low	56.5 °F
Average monthly precipitation	3.2 inches
Average monthly snow	none
Daily chance of precipitation	26.6%
Daily chance of snow	0%

Charleston September Weather Records 1896–2024
Highest temperature	104 °F	September 6, 1954
Lowest temperature	25 °F	September 30, 1899
Highest daily low	78 °F	September 13, 1903
Lowest daily high	50 °F	September 29, 1899
Hottest average high temperature	89.5 °F	1933
Coldest average high temperature	71.2 °F	1974
Most daily precipitation	6.0 inches	September 9, 1926
Most monthly precipitation	14.1 inches	1926
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	84.3	61.8	99	43
September 2	84.1	61.6	103	43
September 3	83.9	61.3	100	39
September 4	83.8	61.0	98	42
September 5	83.6	60.8	102	41
September 6	83.4	60.6	104	41
September 7	83.2	60.4	100	37
September 8	82.9	60.0	100	37
September 9	82.5	59.6	101	42
September 10	82.2	59.2	99	37
September 11	81.8	58.7	100	35
September 12	81.4	58.3	97	35
September 13	81.1	57.9	99	36
September 14	80.8	57.4	99	32
September 15	80.5	56.9	99	39
September 16	80.2	56.5	98	31
September 17	79.9	56.0	98	33
September 18	79.6	55.7	97	34
September 19	79.3	55.4	96	36
September 20	79.0	55.1	95	31
September 21	78.6	54.7	96	34
September 22	78.3	54.3	95	34
September 23	78.0	53.9	93	32
September 24	77.7	53.5	96	30
September 25	77.3	53.1	91	34
September 26	76.9	52.8	95	27
September 27	76.4	52.3	92	32
September 28	76.0	51.9	94	26
September 29	75.5	51.6	99	32
September 30	75.2	51.2	92	25

Weather Station Details

Years	Station	Coordinates
1896–2024	Charleston	location