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Fairfield September Weather

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

Typical Fairfield September Weather 1991–2020
Average daily high	81.5 °F
Average daily low	56.5 °F
Average monthly precipitation	2.9 inches
Average monthly snow	none
Daily chance of precipitation	22.1%
Daily chance of snow	0%

Fairfield September Weather Records 1895–2024
Highest temperature	105 °F	September 15, 1939
Lowest temperature	25 °F	September 30, 1899
Highest daily low	79 °F	September 8, 1919
Lowest daily high	54 °F	September 25, 1975
Hottest average high temperature	92.1 °F	1939
Coldest average high temperature	72.9 °F	1974
Most daily precipitation	4.1 inches	September 3, 1926
Most monthly precipitation	10.3 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	85.9	61.7	103	45
September 2	85.6	61.4	101	45
September 3	85.4	61.1	103	45
September 4	85.3	60.8	102	43
September 5	85.1	60.6	104	42
September 6	84.9	60.3	104	42
September 7	84.6	60.0	103	40
September 8	84.3	59.7	104	40
September 9	83.9	59.3	103	43
September 10	83.6	58.9	101	40
September 11	83.2	58.5	99	39
September 12	82.8	58.2	101	39
September 13	82.4	57.7	103	37
September 14	82.1	57.3	104	33
September 15	81.7	56.7	105	36
September 16	81.3	56.2	98	36
September 17	81.0	55.8	98	37
September 18	80.7	55.4	98	35
September 19	80.4	55.1	98	32
September 20	80.1	54.8	98	35
September 21	79.8	54.4	100	36
September 22	79.4	54.0	99	33
September 23	79.1	53.6	98	32
September 24	78.8	53.2	97	32
September 25	78.5	52.9	94	34
September 26	78.1	52.6	94	31
September 27	77.7	52.2	97	32
September 28	77.3	51.9	97	29
September 29	77.0	51.5	99	31
September 30	76.6	51.2	94	25

Weather Station Details

Years	Station	Coordinates
1895–2024	Fairfield Radio WFIW	location