Cupertino, CA Weather & Growing Conditions
Today
65°F
Sunny
Sunny. High near 65, with temperatures falling to around 61 in the afternoon. North northwest wind 2 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 65°F | Sunny | 2 to 8 mph NNW | 1% |
| Tonight | 48°F | Mostly Cloudy | 1 to 7 mph NW | 2% |
| Thursday | 70°F | Patchy Fog then Mostly Sunny | 1 to 6 mph NNW | 0% |
| Thursday Night | 48°F | Clear | 0 to 3 mph N | 0% |
| Friday | 74°F | Sunny | 0 to 5 mph NNE | 0% |
| Friday Night | 50°F | Mostly Clear | 0 to 3 mph NNW | 0% |
| Saturday | 77°F | Sunny | 2 mph N | 0% |
| Saturday Night | 50°F | Mostly Clear | 2 mph NNW | 0% |
| Sunday | 73°F | Sunny | 0 to 5 mph N | 0% |
| Sunday Night | 52°F | Partly Cloudy | 2 mph NNW | 0% |
| Monday | 70°F | Mostly Sunny | 0 to 5 mph NNW | 2% |
| Monday Night | 50°F | Partly Cloudy | 0 to 5 mph NW | 2% |
| Tuesday | 70°F | Sunny | 0 to 3 mph N | 8% |
| Tuesday Night | 51°F | Mostly Clear | 2 mph W | 13% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Cupertino, CA
Last spring frost
Mar 21
First fall frost
Dec 15
Growing season
275 days
Hardiness zone
9b
Explore more for Cupertino, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Skyline Ridge Preserve, Ca (5.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.