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Antioch September Weather

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

Typical Antioch September Weather 1991–2020
Average daily high	86.7 °F
Average daily low	58.1 °F
Average monthly precipitation	0.1 inches
Daily chance of precipitation	1.2%

Antioch September Weather Records 1915–2021
Highest temperature	110 °F	September 7, 2020
Lowest temperature	38 °F	September 30, 1929
Highest daily low	78 °F	September 27, 1916
Lowest daily high	58 °F	September 30, 1930
Hottest average high temperature	93.2 °F	1944
Coldest average high temperature	79.2 °F	1972
Most daily precipitation	3.9 inches	September 12, 1918
Most monthly precipitation	6.6 inches	1918

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	88.5	58.8	109	45
September 2	88.3	58.7	109	44
September 3	88.2	58.7	109	45
September 4	88.1	58.7	106	46
September 5	88.0	58.6	106	46
September 6	87.9	58.6	107	42
September 7	87.9	58.5	110	44
September 8	87.7	58.5	109	46
September 9	87.5	58.4	110	42
September 10	87.4	58.4	105	45
September 11	87.3	58.4	107	43
September 12	87.3	58.3	106	44
September 13	87.1	58.3	105	43
September 14	87.0	58.2	104	41
September 15	86.8	58.2	104	43
September 16	86.6	58.1	103	44
September 17	86.4	57.9	102	44
September 18	86.2	57.8	102	44
September 19	85.9	57.7	101	43
September 20	85.6	57.5	106	43
September 21	85.3	57.4	106	43
September 22	84.9	57.3	107	46
September 23	84.7	57.2	103	40
September 24	84.5	57.1	104	42
September 25	84.2	57.0	103	42
September 26	84.0	56.9	102	42
September 27	83.7	56.8	100	43
September 28	83.5	56.7	100	41
September 29	83.3	56.7	99	41
September 30	83.2	56.6	102	38

Weather Station Details

Years	Station	Coordinates
1956–2021	Antioch Pumping Plant #3	location
1915–1955	Antioch Fireboard Mills	location