South San Francisco weather
Loading live data…The weather map: all three models at once
NWS, American, European side by side around South San Francisco and nearby towns.Live rain radar →Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitSouth San Francisco, CA is at its warmest in Oct (average highs near 71°F) and coldest in Feb (lows around 44°F), with roughly 31 in of precipitation across the year. Below, compare what NWS, American, European forecast for South San Francisco right now, and see exactly where they disagree.
South San Francisco 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 South San Francisco today?
Will it rain in South San Francisco today or tomorrow?
Which forecast is most accurate for South San Francisco?
What is the warmest month in South San Francisco?
How cold does South San Francisco get?
How much rain does South San Francisco get?
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.