Currently 64°F in Simi Valley, California, USA
64°F
64°F / 60°F
2 mph N
0.00"
Monday, September 21, 2026 5:34 AM PDT
Simi Valley Forecast Summary
Today Tomorrow Wednesday
Variably cloudy, Breezy Sunny Sunny
Variably cloudy, Breezy   Sunny   Sunny
High: 80°F High: 83°F High: 90°F
Low: 58°F Low: 57°F Low: 60°F
Currently in Simi Valley

Temperature, Humidity, Wind & Pressure

Time:  5:34 AM PDT
Temperature:  64°F
Normal Temperature 60°F
Relative Humidity:  87%
Dewpoint:  60°F
Heat Index:  64°F
Wind Chill:  64°F
Wind:  2 mph N (343°)
Gusts:  4 mph
Barometer:  29.89" HgPressure Change rising

Sunrise & Sunset

Sunrise Sunset Daylight
Today: 6:36 AM 6:47 PM 12:11
Tomorrow: 6:37 AM 6:46 PM 12:09
30 Day Sunrise and Sunset Almanac

Extreme Temperatures

Today Time Normal Last Year
High: 64°F 4:59 AM 84°F 82°F
Low: 60°F 12:18 AM 59°F 60°F

Precipitation

60 Min. Today Month Season
0.00" 0.00" 0.60" 0.60"
Season began July 1, 2026
Past Season Precipitation Totals
Data captured from a Peet Bros. Ultimeter 2100
Local Weather Roundup
Simi Valley:
64°F
Simi Valley Forecast
Sunday, September 20, 2026
Warning Today's forecast is coming soon

A weak upper level trough will move over the areas today into Monday, cooling temperatures slightly and increasing the marine layer stratus. A warming trend will begin Tuesday and peak on Thursday, with highs five to ten degrees above normal.

Today: Partly sunny and warm. Light breezes , high near 82°F .

Pollen level is rated "medium".

Predicted air quality is moderate, AQI: 66 (for Simi Valley and Moorpark (courtesy of the VCAPCD)).

Tonight: Mostly cloudy. Light breezes, low around 58°F.

Monday: Low clouds early, becoming mostly sunny. Afternoon breezes, high of about 80°F.

Monday night:Partly cloudy. Light breezes, low near 57°F.

Tuesday: Sunny and warm. Light breezes, high around 83°F.

Tuesday night: Clear. Light breezes, low of about 60°F.

Wednesday: Sunny and very warm, high near 90°F.

Wednesday night: Mostly clear, low around 65°F.

Thursday: Sunny and very warm, high of about 90°F.

Thursday night: Mostly clear, low near 65°F.

Friday: Sunny and warm, high around 88°F.

Friday night: Mostly clear, low of about 64°F.

Saturday: Sunny and warm, high near 86°F.

Simi Valley forecast updated daily. Based on data from the National Weather Service, San Diego office and from WeatherCurrents.
Recently in Simi Valley
Date High Low Ave. Prec.
September 20 82°F 60°F 67°F 0.00"
September 19 81°F 57°F 67°F 0.00"
September 18 78°F 56°F 66°F 0.00"
September 17 78°F 59°F 68°F 0.00"
September 16 80°F 65°F 70°F 0.00"
September 15 83°F 63°F 71°F 0.00"
September 14 84°F 59°F 71°F 0.00"
More Past Weather
Simi Valley Featured Photos
Cloud Stream
Cloud Stream: As seen near the Santa Susana pass, from the 118 freeway. Photo courtesy of Gabe Medrano.
Simi Valley Weather News
Extreme heat returns to SoCal; Thunderstorms hit Temecula

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Posted September 8, 2026, 9:26 PM
Other Weather Information

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