It hardly ever freezes in South San Francisco
South San Francisco has warm winters and cool summers. A typical July afternoon reaches 69°, a January night drops to 45°, and snow is almost unheard of. A typical November afternoon reaches 63°, and nights fall to 49°.
Getting the latest forecast from the National Weather Service…
What stands out about South San Francisco’s weather
Read from 30 years of NOAA records. Each one opens the full story on the Climate page.
Where today sits in South San Francisco’s year
Typical highs and lows month by month, from 30 years of NOAA records.
Weather talk
Road reports, first frosts and storm memories from neighbors in South San Francisco.
Your answer becomes a post in Town Square.
Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for South San Francisco itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Pacifica 4 Sse, CA (7 mi, snow) and San Francisco Intl Airport, CA (3 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.