Simi Valley, CA: Climate and Weather (2024)

Seasonal Weather Patterns in Simi Valley, CA

Temperature

Average Daily Temperature (°F)

	Simi Valley, CA	U.S. Avg.	Difference
January	54	43	+11
July	79	79	No difference

Average Monthly Number of Hot and Freezing Days

	Simi Valley, CA	U.S. Avg.	Difference
Summer: Hot Days	14	11	+3
Winter: Freezing Days	2	12	-10

Read more in Temperature

Sunshine

Average Annual Number of Clear and Cloudy Days

	Simi Valley, CA	U.S. Avg.	Difference
Clear Days	272	217	+55
Cloudy Days	93	148	-55

Average Daylight Hours per Day

	Simi Valley, CA	U.S. Avg.	Difference
January	10	10	No difference
July	15	15	No difference

Read more in Sunshine

Precipitation

Average Annual Number of Rainy and Snow Days

	Simi Valley, CA	U.S. Avg.	Difference
Rainy Days	33	40	-7
Snow Days	0	7	-7

Average Monthly Humidity (%) in Simi Valley, CA

	Simi Valley, CA	U.S. Avg.	Difference
January	59	68	-9%
July	47	61	-14%

Read more in Precipitation

Is Simi Valley, CA, Hot or Cold?

Low, Average, and High Temperatures (°F)

	Low	Average	High
January	43	54	67
February	44	56	69
March	48	60	73
April	50	62	76
May	55	68	84
June	57	72	90
July	60	79	94
August	62	78	97
September	58	78	96
October	55	69	87
November	49	64	77
December	44	55	70

Average Monthly Number of Hot Days

	Simi Valley, CA	U.S. Avg.	Difference
January	0	0	No difference
February	0	0	No difference
March	1	0	+1
April	2	1	+1
May	6	3	+3
June	8	8	No difference
July	16	13	+3
August	18	12	+6
September	13	6	+7
October	6	2	+4
November	1	0	+1
December	0	0	No difference

Average Monthly Number of Freezing Days

	Simi Valley, CA	U.S. Avg.	Difference
January	2	13	-11
February	2	10	-8
March	1	7	-6
April	0	2	-2
May	0	0	No difference
June	0	0	No difference
July	0	0	No difference
August	0	0	No difference
September	0	0	No difference
October	0	2	-2
November	1	6	-5
December	2	12	-10

Simi Valley, CA: Clear/Cloudy Skies, and Daylight Hours

Average Number of Clear Days

	Simi Valley, CA	U.S. Avg.	Difference
January	21	17	+4
February	20	16	+4
March	21	17	+4
April	22	17	+5
May	23	18	+5
June	24	19	+5
July	25	20	+5
August	26	20	+6
September	24	19	+5
October	24	19	+5
November	22	18	+4
December	20	17	+3

Average Number of Cloudy Days

	Simi Valley, CA	U.S. Avg.	Difference
January	10	14	-4
February	8	12	-4
March	10	14	-4
April	8	13	-5
May	8	13	-5
June	6	11	-5
July	6	11	-5
August	5	11	-6
September	6	11	-5
October	7	12	-5
November	8	12	-4
December	11	14	-3

Average Daylight Hours per Day

	Simi Valley, CA	U.S. Avg.	Difference
January	10	10	No difference
February	11	11	No difference
March	12	12	No difference
April	13	13	No difference
May	14	14	No difference
June	15	15	No difference
July	15	15	No difference
August	14	14	No difference
September	13	13	No difference
October	12	12	No difference
November	11	10	+1
December	10	10	No difference

Simi Valley, CA: Rainy Days, Snow Days, and Humidity

Average Number of Rainy Days

	Simi Valley, CA	U.S. Avg.	Difference
January	6	9	-3
February	9	8	+1
March	5	9	-4
April	2	7	-5
May	1	7	-6
June	0	7	-7
July	0	7	-7
August	0	6	-6
September	1	7	-6
October	2	7	-5
November	2	8	-6
December	5	8	-3

Average Number of Snow Days

	Simi Valley, CA	U.S. Avg.	Difference
January	0	2	-2
February	0	2	-2
March	0	1	-1
April	0	0	No difference
May	0	0	No difference
June	0	0	No difference
July	0	0	No difference
August	0	0	No difference
September	0	0	No difference
October	0	0	No difference
November	0	1	-1
December	0	2	-2

Average Humidity (%)

	Simi Valley, CA	U.S. Avg.	Difference
January	59	68	-9%
February	59	66	-7%
March	58	63	-5%
April	54	59	-5%
May	52	61	-9%
June	50	60	-10%
July	47	61	-14%
August	46	62	-16%
September	47	63	-16%
October	48	63	-15%
November	53	65	-12%
December	58	68	-10%

The assessments presented on this website, including those related to crime, safety, cost of living, and other location characteristics (e.g., states, cities, towns, villages, neighborhoods, areas, landmarks), are based on various sources and our internal research methods. These assessments are not guaranteed to be accurate or complete and should not be used as the sole basis for making any decisions.