South San Francisco weather
Loading live data…Cloudy,rain likely tomorrow
NWS, the American and the European model put South San Francisco's high today between 69° and 73°, a 4° split. Tomorrow looks light drizzle around 67°, with a 3% chance of rain.
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 models14-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.
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.
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.