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Petaluma September Weather

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

Typical Petaluma September Weather 1991–2020
Average daily high	81.8 °F
Average daily low	51.6 °F
Average monthly precipitation	0.1 inches
Average monthly snow	none
Daily chance of precipitation	3.2%
Daily chance of snow	0%

Petaluma September Weather Records 1893–2024
Highest temperature	109 °F	September 6, 2022
Lowest temperature	31 °F	September 19, 1929
Highest daily low	76 °F	September 25, 1893
Lowest daily high	58 °F	September 16, 1989
Hottest average high temperature	90.0 °F	1958
Coldest average high temperature	64.8 °F	1918
Most daily precipitation	2.0 inches	September 13, 1918
Most monthly precipitation	2.9 inches	1918
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	81.8	52.9	107	40
September 2	81.7	52.8	107	39
September 3	81.7	52.8	108	39
September 4	81.7	52.7	100	39
September 5	81.8	52.6	108	37
September 6	81.8	52.5	109	44
September 7	81.9	52.4	105	43
September 8	81.8	52.3	103	44
September 9	81.9	52.2	108	42
September 10	81.9	52.2	103	42
September 11	81.9	52.1	104	41
September 12	81.9	52.0	108	37
September 13	81.9	51.9	109	39
September 14	81.9	51.8	109	39
September 15	81.8	51.7	109	41
September 16	81.7	51.7	109	40
September 17	81.4	51.6	105	40
September 18	81.3	51.6	106	36
September 19	81.1	51.5	107	31
September 20	80.8	51.4	103	33
September 21	80.5	51.2	104	39
September 22	80.3	51.1	103	38
September 23	80.2	51.0	103	37
September 24	80.2	50.8	104	38
September 25	80.2	50.7	101	38
September 26	80.0	50.6	102	37
September 27	79.8	50.4	103	37
September 28	79.8	50.2	102	38
September 29	79.9	50.0	100	38
September 30	80.0	49.9	103	38

Weather Station Details

Years	Station	Coordinates
1893–2024	Petaluma Airport	location