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Simi Valley Forecast Summary
Currently in Simi Valley
Temperature, Humidity, Wind & Pressure
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Extreme Temperatures
Precipitation
Data captured from a Peet Bros. Ultimeter 2100
Local Weather Roundup
Simi Valley Forecast
Sunday, September 20, 2026
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
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Simi Valley
Featured Photos
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
Triple-digit heat has returned to the region Tuesday, prompting the Nationa ... Posted September 8, 2026, 9:26 PMOther Weather Information
National Weather Service
Other Simi Valley Weather Forecasts
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