Hillsborough, CA Weather & Growing Conditions
Overnight
55°F
Partly Cloudy
Partly cloudy, with a low around 55. Southwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Partly Cloudy | 3 mph SW | 0% |
| Tuesday | 81°F | Haze then Sunny | 2 to 12 mph SW | 0% |
| Tuesday Night | 56°F | Mostly Clear | 3 to 10 mph SW | 1% |
| Wednesday | 81°F | Sunny | 3 to 10 mph SW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 1 to 10 mph WSW | 0% |
| Thursday | 81°F | Sunny | 1 to 10 mph WSW | 0% |
| Thursday Night | 58°F | Mostly Clear | 1 to 10 mph W | 0% |
| Friday | 83°F | Sunny | 1 to 12 mph W | 0% |
| Friday Night | 59°F | Mostly Clear | 2 to 12 mph W | 0% |
| Saturday | 82°F | Sunny | 2 to 12 mph WSW | 0% |
| Saturday Night | 60°F | Mostly Clear | 7 to 12 mph WSW | 0% |
| Sunday | 78°F | Sunny | 7 to 14 mph WSW | 0% |
| Sunday Night | 57°F | Mostly Clear | 8 to 14 mph WSW | 0% |
| Monday | 74°F | Sunny | 8 to 14 mph WSW | 0% |
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 Aug 4, 2026.