Cupertino, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cupertino, a city in Santa Clara County, California.
This Afternoon
68°F
Mostly Sunny
Mostly sunny. High near 68, with temperatures falling to around 64 in the afternoon. Northwest wind around 9 mph.
7-day forecast for Cupertino
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Mostly Sunny | 9 mph NW | 1% |
| Tonight | 49°F | Mostly Cloudy | 2 to 7 mph WNW | 1% |
| Thursday | 72°F | Patchy Fog then Sunny | 1 to 7 mph NNW | 0% |
| Thursday Night | 50°F | Mostly Clear | 1 to 5 mph N | 0% |
| Friday | 74°F | Sunny | 1 to 6 mph NNE | 0% |
| Friday Night | 51°F | Mostly Clear | 0 to 6 mph NNE | 0% |
| Saturday | 78°F | Sunny | 0 to 3 mph NNW | 0% |
| Saturday Night | 50°F | Mostly Clear | 0 to 3 mph NNW | 0% |
| Sunday | 76°F | Sunny | 1 to 5 mph NNW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Monday | 74°F | Mostly Sunny | 0 to 7 mph NNW | 0% |
| Monday Night | 51°F | Partly Cloudy | 0 to 7 mph NNW | 1% |
| Tuesday | 74°F | Sunny | 0 to 5 mph NNW | 1% |
| Tuesday Night | 52°F | Partly Cloudy | 1 to 5 mph W | 8% |
Forecast source: National Weather Service (api.weather.gov) for Cupertino (37.319, -122.045). Updated through the day.
Growing snapshot for Cupertino
Last spring frost
Jan 6
First fall frost
Dec 23
Growing season
353 days
Hardiness zone
9b
More local growing data for Cupertino: nearby ZIP 94087 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Moffett Federal Airfield, Ca (3.8 mi from Cupertino). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.