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St. Charles September Weather

Averages and records for weather in St. Charles, Missouri in the month of September.

Typical St. Charles September Weather 1991–2020
Average daily high	80.1 °F
Average daily low	57.3 °F
Average monthly precipitation	3.2 inches
Average monthly snow	none
Daily chance of precipitation	23.3%
Daily chance of snow	0%

St. Charles September Weather Records 1893–2024
Highest temperature	106 °F	September 5, 1954
Lowest temperature	31 °F	September 24, 1983
Highest daily low	78 °F	September 7, 1899
Lowest daily high	48 °F	September 26, 1942
Hottest average high temperature	90.9 °F	1939
Coldest average high temperature	72.7 °F	1918
Most daily precipitation	4.1 inches	September 4, 1910
Most monthly precipitation	10.2 inches	1911
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	84.5	62.4	104	46
September 2	84.2	62.2	103	48
September 3	83.9	61.9	105	43
September 4	83.6	61.6	106	39
September 5	83.5	61.3	106	39
September 6	83.2	61.1	105	41
September 7	82.9	60.7	102	44
September 8	82.6	60.4	103	39
September 9	82.3	59.9	104	41
September 10	81.9	59.5	101	45
September 11	81.5	59.1	101	39
September 12	81.1	58.6	102	43
September 13	80.7	58.2	102	36
September 14	80.4	57.7	102	41
September 15	80.1	57.2	104	39
September 16	79.8	56.8	100	39
September 17	79.6	56.4	99	37
September 18	79.4	56.0	102	33
September 19	79.1	55.8	98	33
September 20	78.8	55.5	100	34
September 21	78.5	55.2	99	37
September 22	78.1	54.7	98	36
September 23	77.7	54.3	95	34
September 24	77.4	53.9	97	31
September 25	77.0	53.4	94	33
September 26	76.6	53.0	95	36
September 27	76.2	52.6	91	35
September 28	75.7	52.2	100	31
September 29	75.3	51.8	105	34
September 30	74.9	51.4	96	31

Weather Station Details

Years	Station	Coordinates
1893–2024	St. Charles Elm Point	location