Simi Valley, CA Weather Forecast
Ventura County, California
Seven-day outlook
53–72°F across the weekThe week runs between 53° and 72°, with Tuesday the warmest day of it. There is no real trend across it: one day looks much like the next. Saturday is the wettest day, peaking near 71%. 4 of the 7 days stay dry.
Forecasts come from the National Weather Service's own computer models, and current conditions from the nearest reporting weather station. Both are served through the weather API. A forecast is guidance, not a warning, and anything the Weather Service has actually issued is on the live map.
The written summaries on this page are generated from the forecast data above, not by a meteorologist. Each sentence is a reading of the same numbers you can see, and no forecaster has reviewed them.
About the Simi Valley forecast
Simi Valley sits at 34.2669°N, 118.7485°W in Ventura County, California. The forecast above is drawn for that point from the National Weather Service's own computer models: a seven-day outlook, and a finer-grained one covering the next eighteen hours where it reaches, and the radar and alert panels show what the Weather Service has out over the area right now.
- County
- Ventura County
- Coordinates
- 34.2669°N, 118.7485°W
- Population
- 125,113 · 2023 estimate
- Land area
- 41.542 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Simi Valley, and the forecast is for that location, not for every address inside the city limits, and a large city can have real weather differences from one side to the other.
How well can the network see Simi Valley?
The nearest Doppler radar is KVTX (Los Angeles, CA), 27 miles to the WNW. A WSR-88D's lowest routine scan sits half a degree above horizontal, and the earth curves away beneath it, so by the time that beam reaches Simi Valley its center is about 1,600 ft above ground. That is about as close as radar coverage gets in the United States: the lowest scan is still near the ground when it reaches Simi Valley, so low-level rotation and the leading edge of a gust front show up on it. Simi Valley is closer to its radar than 76% of US cities.
The closest instrument actually measuring the air is KVNY · Van Nuys Arpt on the ASOS/AWOS network, 15 miles away. Far enough that "current conditions" for Simi Valley is an educated reading of somewhere else, worth knowing before you plan around a single temperature.
Beam height is the standard 4/3-earth approximation for the 0.5° scan and assumes normal refraction; it is where the center of the beam is, not its edges, and unusual temperature profiles bend it. Radar siting from the NWS WSR-88D network, station positions from the California observing network as of this build.
Forecasts near Simi Valley
- Moorpark, CA7 mi
- Agoura Hills, CA8 mi
- Thousand Oaks, CA9 mi
- Westlake Village, CA10 mi
- Calabasas, CA10 mi
- Fillmore, CA13 mi
- Camarillo, CA16 mi
- Malibu, CA17 mi
Elsewhere in California
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