Foster City, CA Weather & Climate Normals
What a normal year in Foster City actually looks like
On the 30-year record NOAA keeps for Foster City, CA, the comfort score comes out to 73/100, mild with real seasons: A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. Only 8 months a year land in the 55–75°F range this site treats as mild.
How much Foster City's weather actually swings
Average temperatures in Foster City run from 49°F in Dec up to 69°F in Jul, a 19.4°F seasonal swing, one of the smaller gaps in this dataset.
How wet Foster City actually gets
Over a typical year, Foster City sees about 19.02in of precipitation a year across roughly 55 days with measurable rain or snow, with 0in of snow a year.
Foster City against the rest of the country
Out of 4876 cities scored here, Foster City comes in at 223; within CA alone it ranks 223 of 429. Population is about 32,657.
Checking the actual forecast
These figures come from REDWOOD CITY, CA US, the NOAA station 6.1 miles from Foster City, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is