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Simi Valley Forecast Summary
Currently in Simi Valley
Temperature, Humidity, Wind & Pressure
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Data captured from a Peet Bros. Ultimeter 2100
Local Weather Roundup
Simi Valley Forecast
Sunday, September 7, 2025
 Forecast not current
Near to slightly above normal temperatures will continue today with most areas a few degrees warmer than yesterday. A significant cooling trend will begin Monday, resulting in much cooler than normal temperatures by Wednesday and Thursday as a low pressure system approaches California. Today: Sunny and very warm. Light breezes , high near 90°F . Pollen level is rated "medium". Predicted air quality is good, AQI: 50 (for Simi Valley and Moorpark (courtesy of the VCAPCD)). Tonight: Clear. Light breezes, low around 60°F. Monday: Sunny. Warm and breezy, high of about 85°F. Monday night:Increasing clouds, then patchy fog developing. Light breezes, low near 58°F. Tuesday: Low clouds and fog early, becoming sunny. Afternoon breezes, high around 79°F. Tuesday night: Mostly cloudy, then patchy fog developing. Light breezes, low of about 57°F. Wednesday: Low clouds and fog early, becoming sunny, high near 76°F. Wednesday night: Mostly cloudy, low around 56°F. Thursday: Mostly sunny, high of about 75°F. Thursday night: Mostly cloudy, then patchy fog developing, low near 55°F. Friday: Low clouds and fog early, becoming sunny, high around 79°F. Friday night: Mostly cloudy, then patchy fog developing, low of about 57°F. Saturday: Low clouds and fog early, becoming sunny and warm, high near 83°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
Early morning thunderstorms rock inland and coastal communities Friday
Low pressure over northern Baja California is bringing monsoonal moisture i ... Posted July 18, 2025, 3:59 PMOther Weather Information
National Weather Service
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