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San Jose September Weather

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

Typical San Jose September Weather 1991–2020
Average daily high	81.1 °F
Average daily low	57.5 °F
Average monthly precipitation	0.1 inches
Daily chance of precipitation	2.6%

San Jose September Weather Records 1893–2024
Highest temperature	109 °F	September 6, 2022
Lowest temperature	35 °F	September 23, 1903
Highest daily low	78 °F	September 3, 2017
Lowest daily high	60 °F	September 22, 1896
Hottest average high temperature	86.0 °F	1984
Coldest average high temperature	72.9 °F	1893
Most daily precipitation	4.3 inches	September 12, 1918
Most monthly precipitation	6.3 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	81.5	58.5	108	44
September 2	81.4	58.4	107	42
September 3	81.4	58.4	99	45
September 4	81.5	58.3	99	43
September 5	81.5	58.3	104	40
September 6	81.6	58.2	109	42
September 7	81.6	58.1	106	44
September 8	81.5	58.0	104	42
September 9	81.5	57.9	106	43
September 10	81.5	57.9	98	42
September 11	81.4	57.8	100	44
September 12	81.3	57.7	101	43
September 13	81.3	57.7	102	37
September 14	81.3	57.6	104	39
September 15	81.1	57.5	102	36
September 16	81.0	57.5	103	43
September 17	80.8	57.4	102	40
September 18	80.7	57.3	100	42
September 19	80.5	57.1	98	39
September 20	80.2	57.0	100	40
September 21	80.0	56.8	101	39
September 22	79.8	56.7	101	36
September 23	79.7	56.6	100	35
September 24	79.7	56.4	98	40
September 25	79.6	56.3	99	42
September 26	79.4	56.2	98	38
September 27	79.3	56.0	98	41
September 28	79.2	55.8	101	38
September 29	79.3	55.7	96	42
September 30	79.3	55.6	95	35

Weather Station Details

Years	Station	Coordinates
1999–2024	San Jose 2	location
1893–1998	San Jose	location