Simi Valley weather by month
Average highs run from 70°F in January to 95°F in July, and January nights average 43°F. It gets 16 inches of rain and melted snow a year, with almost no snow. Expect about 115 days a year at 90°F or hotter. The most comfortable months are October to January and March to May.
Best time to visit Simi Valley
For comfortable weather, go in October to January and March to May. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 70°F | 43°F | 3.7 in | 0.0 in | 5 | 0 | 3 | mild |
| February | 70°F | 44°F | 4.6 in | 0.0 in | 5 | 0 | 2 | mild |
| March | 74°F | 46°F | 2.7 in | 0.0 in | 4 | 1 | 1 | mild |
| April | 78°F | 48°F | 0.8 in | 0.0 in | 1 | 4 | 0 | warm |
| May | 82°F | 53°F | 0.4 in | 0.0 in | 1 | 7 | 0 | warm |
| June | 89°F | 57°F | 0.1 in | 0.0 in | 0 | 15 | 0 | hot |
| July | 95°F | 61°F | 0.0 in | 0.0 in | 0 | 25 | 0 | very hot |
| August | 97°F | 61°F | 0.0 in | 0.0 in | 0 | 27 | 0 | very hot |
| September | 94°F | 59°F | 0.1 in | 0.0 in | 0 | 22 | 0 | hot |
| October | 85°F | 53°F | 0.6 in | 0.0 in | 1 | 11 | 0 | warm |
| November | 76°F | 46°F | 0.8 in | 0.0 in | 2 | 3 | 1 | warm |
| December | 69°F | 42°F | 2.7 in | 0.0 in | 3 | 0 | 4 | mild |
| Year | 82°F avg | 51°F avg | 16.4 in | 0.0 in | 22 | 115 | 11 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Woodland Hills Pierce College, CA (USC00049785), 13.3 miles from the city center. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Simi Valley
The shortest day is December 21, with 9h 51m of daylight; the longest is June 21, with 14h 26m. The earliest sunset comes around December 1 (4:44 pm) and the latest around June 21 (8:10 pm). The sun sets after 8 pm on 60 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:01 am | 5:08 pm | 10h 07m |
| February | 6:40 am | 5:38 pm | 10h 59m |
| March | 7:05 am | 7:02 pm | 11h 57m |
| April | 6:23 am | 7:26 pm | 13h 03m |
| May | 5:53 am | 7:50 pm | 13h 57m |
| June | 5:42 am | 8:08 pm | 14h 26m |
| July | 5:54 am | 8:07 pm | 14h 13m |
| August | 6:16 am | 7:41 pm | 13h 25m |
| September | 6:38 am | 7:01 pm | 12h 23m |
| October | 7:00 am | 6:20 pm | 11h 20m |
| November | 6:28 am | 4:50 pm | 10h 22m |
| December | 6:54 am | 4:46 pm | 9h 52m |
Calculated for 2026 at the center of Simi Valley with NOAA's solar equations, in local clock time (Pacific Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Simi Valley getting warmer?
The last 10 years averaged 3.1°F warmer than the 20th century. See the climate stripes for Simi Valley.Frequently asked questions
What is the warmest month in Simi Valley?
August is the warmest month, with an average high of 97°F and an average low of 61°F (NOAA 1991-2020 normals).
What is the coldest month in Simi Valley?
December is the coldest, with average lows of 42°F and highs of 69°F.
What is the rainiest month in Simi Valley?
February gets the most precipitation, 4.6 inches on average. August is the driest at 0.0 inches.
Does it snow in Simi Valley?
Very little. The normal yearly snowfall is under one inch.
When is the best time to visit Simi Valley?
For comfortable weather, October to January and March to May. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Simi Valley?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Simi Valley profile.
Compare the weather: Simi Valley vs Thousand Oaks, Simi Valley vs Santa Clarita, Simi Valley vs Oxnard, Simi Valley vs Santa Monica.