NWS, American, European side by side around Simi Valley and nearby towns.Live rain radar →
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Next 14 hours
consensus of the three models
7-day forecast
where the models agree, and where they split
Simi Valley, CA is at its warmest in Jul (average highs near 92°F) and coldest in Feb (lows around 45°F), with roughly 26 in of precipitation across the year. Below, compare what NWS, American, European forecast for Simi Valley right now, and see exactly where they disagree.
Simi Valley climate by month
average daytime high and overnight low across a typical year
Jan
61°
46°
Feb
61°
45°
Mar
62°
46°
Apr
70°
50°
May
72°
54°
Jun
79°
59°
Jul
92°
69°
Aug
90°
67°
Sep
85°
64°
Oct
84°
60°
Nov
72°
52°
Dec
69°
50°
Common questions
What's the weather in Simi Valley today?
On this page we show what NWS, American, European each forecast for Simi Valley today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Simi Valley today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Simi Valley and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Simi Valley?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Simi Valley forecast is reliable, and when they split you should expect surprises. See our tested US accuracy scoreboard for how the models compare.
What is the warmest month in Simi Valley?
Jul is typically the warmest month in Simi Valley, with average highs around 92°F.
How cold does Simi Valley get?
The coldest month in Simi Valley is Feb, when overnight lows average about 45°F.
How much rain does Simi Valley get?
Simi Valley sees roughly 26 in of precipitation a year, with Feb usually the wettest month.
The forecasts Americans check
The two biggest apps keep their model a secret, so we can't show their numbers, only link you to them. The National Weather Service is public, so its data sits right in the comparison above.