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
65°F
Light Rain Likely
Rain likely. Partly sunny. High near 65, with temperatures falling to around 60 in the afternoon. South southwest wind 3 to 10 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Hillsborough
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Light Rain Likely | 3 to 10 mph SSW | 63% |
| Tonight | 50°F | Chance Light Rain then Mostly Cloudy | 2 to 6 mph SE | 39% |
| Wednesday | 66°F | Sunny | 5 to 14 mph N | 3% |
| Wednesday Night | 52°F | Mostly Cloudy | 1 to 14 mph NW | 0% |
| Thursday | 70°F | Patchy Fog then Sunny | 1 to 6 mph NNW | 0% |
| Thursday Night | 52°F | Mostly Clear | 1 to 7 mph NNW | 0% |
| Friday | 73°F | Sunny | 1 to 6 mph N | 0% |
| Friday Night | 52°F | Clear | 1 to 6 mph NNW | 0% |
| Saturday | 77°F | Sunny | 3 mph NNE | 0% |
| Saturday Night | 54°F | Mostly Clear | 2 to 6 mph NW | 0% |
| Sunday | 75°F | Mostly Sunny | 2 to 6 mph NNW | 0% |
| Sunday Night | 55°F | Partly Cloudy | 2 to 6 mph NW | 0% |
| Monday | 72°F | Partly Sunny | 2 to 7 mph NW | 1% |
| Monday Night | 53°F | Partly Cloudy | 1 to 7 mph NW | 2% |
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
Atherton
Baywood Park
Belmont
Brisbane
Broadmoor
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
Pescadero
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 Nov 4, 2026.