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Fairfield September Weather

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

Typical Fairfield September Weather 1991–2020
Average daily high	87.2 °F
Average daily low	55.9 °F
Average monthly precipitation	0.1 inches
Average monthly snow	none
Daily chance of precipitation	2.1%
Daily chance of snow	0%

Fairfield September Weather Records 1950–2024
Highest temperature	114 °F	September 6, 2022
Lowest temperature	39 °F	September 20, 1986
Highest daily low	76 °F	September 6, 2022
Lowest daily high	62 °F	September 17, 1977
Hottest average high temperature	95.7 °F	1984
Coldest average high temperature	79.5 °F	1977
Most daily precipitation	2.5 inches	September 18, 1959
Most monthly precipitation	2.5 inches	1959
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	88.6	56.9	110	43
September 2	88.3	56.8	110	49
September 3	88.3	56.7	109	49
September 4	88.3	56.7	105	50
September 5	88.3	56.6	114	44
September 6	88.3	56.6	114	49
September 7	88.2	56.5	111	47
September 8	88.1	56.4	110	48
September 9	88.0	56.4	105	44
September 10	87.9	56.4	107	40
September 11	87.8	56.3	101	45
September 12	87.7	56.2	103	45
September 13	87.6	56.2	112	43
September 14	87.5	56.1	110	45
September 15	87.3	56.0	107	43
September 16	87.1	55.9	104	45
September 17	86.8	55.8	102	47
September 18	86.5	55.7	109	41
September 19	86.3	55.6	103	42
September 20	85.9	55.5	99	39
September 21	85.4	55.3	101	42
September 22	85.1	55.1	100	42
September 23	84.8	55.0	102	46
September 24	84.7	54.9	102	47
September 25	84.6	54.9	101	41
September 26	84.4	54.7	99	45
September 27	84.0	54.6	100	44
September 28	83.8	54.4	101	45
September 29	83.7	54.3	100	43
September 30	83.6	54.2	100	43

Weather Station Details

Years	Station	Coordinates
1950–2024	Fairfield	location