Cupertino, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cupertino, a city in Santa Clara County, California.
Overnight
59°F
Mostly Clear
Mostly clear, with a low around 59. West northwest wind around 3 mph.
7-day forecast for Cupertino
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Mostly Clear | 3 mph WNW | 0% |
| Tuesday | 92°F | Haze then Sunny | 2 to 7 mph NE | 0% |
| Tuesday Night | 59°F | Mostly Clear | 5 mph NNW | 0% |
| Wednesday | 91°F | Sunny | 2 to 7 mph WNW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 0 to 6 mph WNW | 0% |
| Thursday | 90°F | Sunny | 0 to 7 mph NW | 0% |
| Thursday Night | 61°F | Mostly Clear | 1 to 7 mph NW | 0% |
| Friday | 94°F | Sunny | 1 to 7 mph NW | 0% |
| Friday Night | 63°F | Mostly Clear | 0 to 7 mph WNW | 0% |
| Saturday | 94°F | Sunny | 0 to 7 mph WNW | 0% |
| Saturday Night | 63°F | Mostly Clear | 1 to 7 mph W | 0% |
| Sunday | 90°F | Sunny | 1 to 8 mph W | 0% |
| Sunday Night | 60°F | Mostly Clear | 3 to 8 mph W | 0% |
| Monday | 84°F | Sunny | 2 to 8 mph WSW | 0% |
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 Aug 4, 2026.