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Santa Rosa September Weather

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

Typical Santa Rosa September Weather 1991–2020
Average daily high	82.9 °F
Average daily low	50.4 °F
Average monthly precipitation	0.1 inches
Daily chance of precipitation	5.0%

Santa Rosa September Weather Records 1902–2024
Highest temperature	114 °F	September 6, 2022
Lowest temperature	30 °F	September 29, 1915
Highest daily low	70 °F	September 18, 1984
Lowest daily high	60 °F	September 29, 1998
Hottest average high temperature	89.6 °F	1936
Coldest average high temperature	72.2 °F	1986
Most daily precipitation	2.9 inches	September 23, 1904
Most monthly precipitation	4.4 inches	1904

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	83.2	52.0	110	36
September 2	83.1	51.9	110	34
September 3	83.2	51.8	108	34
September 4	83.3	51.7	108	34
September 5	83.3	51.6	112	34
September 6	83.3	51.5	114	32
September 7	83.4	51.3	111	34
September 8	83.3	51.2	108	34
September 9	83.3	51.1	107	32
September 10	83.3	51.0	102	32
September 11	83.3	50.9	104	30
September 12	83.3	50.8	108	30
September 13	83.3	50.7	110	30
September 14	83.2	50.6	110	32
September 15	83.0	50.5	107	32
September 16	82.9	50.4	108	32
September 17	82.6	50.3	104	34
September 18	82.5	50.2	104	32
September 19	82.3	50.1	104	30
September 20	82.0	50.0	104	32
September 21	81.7	49.9	105	32
September 22	81.6	49.7	105	30
September 23	81.5	49.6	105	30
September 24	81.6	49.5	103	34
September 25	81.5	49.4	105	32
September 26	81.3	49.3	101	30
September 27	81.2	49.1	103	30
September 28	81.2	48.9	104	30
September 29	81.2	48.7	104	30
September 30	81.3	48.6	102	32

Weather Station Details

Years	Station	Coordinates
1998–2024	Santa Rosa Sonoma County Airport	location
1902–1998	Santa Rosa	location