Hillsborough, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hillsborough, a town in San Mateo County, California.
This Afternoon
76°F
Sunny
Sunny. High near 76, with temperatures falling to around 72 in the afternoon. West wind around 14 mph, with gusts as high as 21 mph.
7-day forecast for Hillsborough
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Sunny | 14 mph W | 0% |
| Tonight | 57°F | Partly Cloudy | 3 to 13 mph W | 1% |
| Saturday | 78°F | Sunny | 2 to 12 mph W | 0% |
| Saturday Night | 57°F | Mostly Cloudy | 6 to 12 mph W | 1% |
| Sunday | 71°F | Partly Sunny | 6 to 9 mph W | 4% |
| Sunday Night | 57°F | Mostly Cloudy | 3 to 9 mph W | 4% |
| Monday | 73°F | Mostly Sunny | 3 to 10 mph WSW | 1% |
| Monday Night | 57°F | Partly Cloudy | 3 to 10 mph WSW | 0% |
| Tuesday | 77°F | Sunny | 3 to 9 mph WSW | 0% |
| Tuesday Night | 56°F | Mostly Clear | 1 to 9 mph WSW | 0% |
| Wednesday | 86°F | Sunny | 1 to 9 mph WSW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 0 to 9 mph WSW | 0% |
| Thursday | 87°F | Sunny | 0 to 9 mph WSW | 0% |
| Thursday Night | 60°F | Mostly Clear | 3 to 9 mph W | 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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Baywood Park
Belmont
Brisbane
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Burlingame
Colma
Daly City
El Granada
Emerald Lake Hills
Foster City
Half Moon Bay
Highlands
La Honda
Ladera
Loma Mar
Millbrae
Montara
Moss Beach
North Fair Oaks
Pacifica
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Portola Valley
Redwood City
San Bruno
San Carlos
San Mateo
South San Francisco
West Menlo Park
Woodside
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 Sep 19, 2026.