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El Cajon September Weather

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

Typical El Cajon September Weather 1991–2020
Average daily high	88.5 °F
Average daily low	62.5 °F
Average monthly precipitation	0.1 inches
Daily chance of precipitation	2.0%

El Cajon September Weather Records 1899–2024
Highest temperature	114 °F	September 5, 2020
Lowest temperature	37 °F	September 18, 1900
Highest daily low	82 °F	September 7, 1904
Lowest daily high	63 °F	September 30, 1916
Hottest average high temperature	95.0 °F	1956
Coldest average high temperature	79.9 °F	1986
Most daily precipitation	1.4 inches	September 7, 1939
Most monthly precipitation	5.0 inches	1939

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	89.5	64.6	113	46
September 2	89.3	64.5	111	48
September 3	89.3	64.4	109	48
September 4	89.2	64.2	109	42
September 5	89.2	64.1	114	50
September 6	89.2	64.0	110	45
September 7	89.1	63.9	109	45
September 8	88.9	63.8	104	45
September 9	88.8	63.6	108	48
September 10	88.7	63.4	106	47
September 11	88.6	63.2	107	42
September 12	88.5	63.0	102	44
September 13	88.4	62.9	106	44
September 14	88.3	62.8	103	42
September 15	88.3	62.6	108	43
September 16	88.3	62.4	111	40
September 17	88.3	62.3	111	42
September 18	88.1	62.1	104	37
September 19	87.9	61.9	103	41
September 20	87.5	61.7	105	40
September 21	87.2	61.4	105	41
September 22	86.9	61.1	104	41
September 23	86.7	60.9	102	42
September 24	86.6	60.6	102	44
September 25	86.6	60.5	104	44
September 26	86.4	60.3	109	42
September 27	86.2	60.1	109	40
September 28	86.0	59.9	103	42
September 29	85.8	59.6	106	43
September 30	85.7	59.4	110	43

Weather Station Details

Years	Station	Coordinates
1979–2024	El Cajon	location
1899–1979	El Cajon 2 E	location