Hillsborough, CA Weather & Growing Conditions

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

Overnight

50°F

Mostly Clear

Mostly clear, with a low around 50. East northeast wind around 5 mph.

7-day forecast for Hillsborough

When	Temp	Forecast	Wind	Precip
Overnight	50°F	Mostly Clear	5 mph ENE	0%
Wednesday	66°F	Sunny	5 to 15 mph NNE	2%
Wednesday Night	52°F	Mostly Cloudy	1 to 14 mph WNW	2%
Thursday	71°F	Mostly Sunny	1 to 5 mph NW	0%
Thursday Night	50°F	Mostly Clear	1 to 5 mph N	0%
Friday	74°F	Sunny	1 to 5 mph NNE	0%
Friday Night	51°F	Mostly Clear	0 to 5 mph N	0%
Saturday	77°F	Sunny	0 to 3 mph NNE	0%
Saturday Night	51°F	Mostly Clear	5 mph NW	0%
Sunday	72°F	Mostly Sunny	2 to 6 mph NNW	0%
Sunday Night	53°F	Partly Cloudy	1 to 6 mph NW	0%
Monday	70°F	Mostly Sunny	1 to 7 mph NW	3%
Monday Night	53°F	Partly Cloudy	1 to 7 mph NW	3%
Tuesday	70°F	Sunny	1 to 5 mph NNW	6%

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 Nov 4, 2026.