South San Francisco weather
Loading live data…Partly cloudy,much the same tomorrow
NWS, the American and the European model agree on a high near 69° in South San Francisco today. Tomorrow looks fog around 68°, with a 3% chance of rain.
CheckWeather.io on iPhoneFree. No ads, no account.South San Francisco weather alerts and warnings
active National Weather Service watches, warnings and advisoriesChecking the National Weather Service for active alerts covering South San Francisco…
South San Francisco weather in numbers
from 30 years of measured normalsSouth San Francisco swings 27°F across the year, from 71°F highs in October to 44°F lows in February, and January is usually the wettest month in a year that brings about 31 in of precipitation.
The weather map: all three models at once
NWS, American, European side by side around South San Francisco and nearby towns.Live rain radar →South San Francisco hourly forecast: next 14 hours
consensus of the three modelsRain in the next 24 hours, model by model
each model's own hourly precipitation, side by sideLoading the three models…
South San Francisco 10-day forecast, out to 14 days
where the models agree, and where they splitSouth San Francisco, California (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.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.
South San Francisco climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in South San Francisco?
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 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.
What do you think of the forecasts?
your vote countsThe accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.
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Where the models disagree
temperature and rain, judged separatelyThe models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.