Castro Valley weather
Loading live data…Latest for Castro Valley: NWS (National Blend (NBM)): 68° Clear · American (NOAA GFS): 65° Clear · European (ECMWF): 65° Partly cloudy.
The weather map: all three models at once
NWS, American, European side by side around Castro Valley and nearby towns.Live rain radar →Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitCastro Valley, CA is at its warmest in Oct (average highs near 75°F) and coldest in Feb (lows around 42°F), with roughly 36 in of precipitation across the year. Below, compare what NWS, American, European forecast for Castro Valley right now, and see exactly where they disagree.
Castro Valley climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in the US?
CheckWeather Score — graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy — each measured against ERA5 (the recorded weather) over the last 30 days across 40 cities. Lower error means a higher score. The apps you know (AccuWeather, Apple Weather, The Weather Channel) are built on these models.
Common questions
What's the weather in Castro Valley today?
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Which forecast is most accurate for Castro Valley?
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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.