Portola Valley, CA Weather & Growing Conditions
Today
66°F
Sunny
Sunny. High near 66, with temperatures falling to around 61 in the afternoon. North northeast wind 2 to 12 mph, with gusts as high as 21 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Sunny | 2 to 12 mph NNE | 2% |
| Tonight | 50°F | Mostly Cloudy | 1 to 12 mph NW | 2% |
| Thursday | 71°F | Mostly Sunny | 2 mph NNW | 0% |
| Thursday Night | 49°F | Clear | 0 to 3 mph NNE | 0% |
| Friday | 74°F | Sunny | 2 mph NNE | 0% |
| Friday Night | 51°F | Mostly Clear | 2 mph N | 0% |
| Saturday | 76°F | Sunny | 1 mph N | 0% |
| Saturday Night | 50°F | Mostly Clear | 2 mph NNW | 0% |
| Sunday | 72°F | Sunny | 2 mph N | 0% |
| Sunday Night | 53°F | Partly Cloudy | 2 mph NW | 0% |
| Monday | 70°F | Mostly Sunny | 3 mph NW | 2% |
| Monday Night | 52°F | Partly Cloudy | 3 mph NW | 2% |
| Tuesday | 70°F | Sunny | 2 mph NNW | 6% |
| Tuesday Night | 53°F | Mostly Clear | 2 mph SW | 14% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Portola Valley, CA
Last spring frost
Feb 25
First fall frost
Nov 25
Growing season
274 days
Hardiness zone
9b
Explore more for Portola Valley, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Woodside Fire Stn 1, Ca (4.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.