Hillsborough, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Hillsborough, a town in San Mateo County, California.

Today

82°F

Haze then Sunny

Haze between 7am and 8am. Sunny. High near 82, with temperatures falling to around 79 in the afternoon. Southwest wind 2 to 10 mph.

7-day forecast for Hillsborough

When	Temp	Forecast	Wind	Precip
Today	82°F	Haze then Sunny	2 to 10 mph SW	0%
Tonight	56°F	Mostly Clear	2 to 9 mph SW	1%
Wednesday	82°F	Sunny	2 to 9 mph SW	0%
Wednesday Night	58°F	Mostly Clear	1 to 9 mph WSW	0%
Thursday	82°F	Sunny	1 to 9 mph WSW	0%
Thursday Night	58°F	Mostly Clear	1 to 9 mph W	0%
Friday	84°F	Sunny	1 to 10 mph WNW	0%
Friday Night	59°F	Mostly Clear	2 to 10 mph W	0%
Saturday	84°F	Sunny	2 to 10 mph W	0%
Saturday Night	60°F	Mostly Clear	5 to 10 mph WSW	0%
Sunday	79°F	Sunny	5 to 13 mph WSW	0%
Sunday Night	58°F	Mostly Clear	7 to 13 mph WSW	0%
Monday	76°F	Sunny	7 to 13 mph WSW	0%
Monday Night	57°F	Mostly Clear	6 to 13 mph SW	0%

Forecast source: National Weather Service (api.weather.gov) for Hillsborough (37.557, -122.359). Updated through the day.

Growing snapshot for Hillsborough

Last spring frost

Dec 29

First fall frost

Dec 26

Growing season

365 days

Hardiness zone

10a

More local growing data for Hillsborough: nearby ZIP 94010 weather · frost dates · planting calendar · California frost dates

Nearby towns & communities

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Climate data from the nearest NOAA station, San Francisco Intl Ap, Ca (3.3 mi from Hillsborough). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.