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Weather in Foster City, CA · National Weather Service + NOAA

It hardly ever freezes in Foster City

Foster City has warm winters and cool summers, with very little rain. A typical July afternoon reaches 72°, a January night drops to 44°, and snow is almost unheard of. A typical November afternoon reaches 64°, and nights fall to 48°.

Winter 59°/45°Spring 65°/49°Summer 72°/56°Fall 69°/52°
Right now
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Sunrise 9:35 am · sunset 8:09 pm

Getting the latest forecast from the National Weather Service…

What stands out about Foster City’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
It hardly ever freezesOnly 12% of years see a night at 32° or below.Cool summersJuly afternoons average 72°, cooler than 99% of U.S. towns.Snow is rareNo measurable snow in a normal year.
A normal year

Where today sits in Foster City’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
59° / 45°
Snow is rare
Spring
65° / 49°
Frost is rare by spring
Summer
72° / 56°
4 days reach 90° in a normal year
Fall now
69° / 52°
Mild well into the fall
Best months to be outside
MarAprMayJunJulAugSepOctNov
Highs of 62–84° and lows of 40° or more
How much snow does Foster City get?Almost none.When is it wettest?December, with 3.8 inches.Is it warmer than it used to be?+1.6° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Foster City.

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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 Foster City itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Oakland Museum, CA (16 mi, snow) and San Francisco Intl Airport, CA (7 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.