Hillsborough, CA Weather & Growing Conditions
Overnight
51°F
Chance Light Rain
A chance of rain before 4am. Partly cloudy, with a low around 51. East northeast wind around 7 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Chance Light Rain | 7 mph ENE | 25% |
| Wednesday | 65°F | Sunny | 5 to 16 mph N | 2% |
| Wednesday Night | 52°F | Mostly Cloudy | 1 to 15 mph NW | 2% |
| Thursday | 70°F | Mostly Sunny | 1 to 6 mph NNW | 0% |
| Thursday Night | 51°F | Mostly Clear | 1 to 7 mph N | 0% |
| Friday | 72°F | Sunny | 1 to 5 mph NNE | 0% |
| Friday Night | 52°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 76°F | Sunny | 3 mph NNE | 0% |
| Saturday Night | 52°F | Mostly Clear | 2 to 6 mph NW | 0% |
| Sunday | 71°F | Mostly Sunny | 2 to 6 mph NNW | 0% |
| Sunday Night | 54°F | Partly Cloudy | 2 to 6 mph NW | 0% |
| Monday | 69°F | Mostly Sunny | 2 to 8 mph NW | 3% |
| Monday Night | 53°F | Partly Cloudy | 2 to 8 mph NW | 3% |
| Tuesday | 69°F | Sunny | 1 to 5 mph NNW | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Hillsborough, CA
Last spring frost
Dec 29
First fall frost
Dec 26
Growing season
365 days
Hardiness zone
10a
Explore more for Hillsborough, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, San Francisco Intl Ap, Ca (3.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.