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Weather extremes
How extreme does South San Francisco's weather get?
The hottest, coldest, wettest and snowiest days South San Francisco has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.
The four kinds of extreme
The hottest, coldest, wettest and snowiest single days South San Francisco has recorded — each shown against what a normal day that time of year looks like.
That is about 32°F hotter than a normal July afternoon in South San Francisco (typical high near 73°F).
The three most extreme on record
About 21°F colder than a normal December night in South San Francisco (typical low near 45°F).
The three most extreme on record
More rain in a single day than South San Francisco usually gets in the whole month of January (typical January total about 3.9 in).
The three most extreme on record
How hot and cold it gets, month by month
The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.
South San Francisco's record heat sits well above even a hot day for the season — July's 105°F is about 32°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.
In plain terms
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at San Francisco Intl AP (NOAA GHCN station USW00023234), about 5 km from the city centre.