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
81°F
Sunny
Sunny. High near 81, with temperatures falling to around 79 in the afternoon. North northwest wind around 10 mph, with gusts as high as 18 mph.
7-day forecast for Cupertino
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 81°F | Sunny | 10 mph NNW | 0% |
| Tonight | 56°F | Mostly Clear then Patchy Fog | 1 to 9 mph NNW | 0% |
| Saturday | 84°F | Areas Of Fog then Mostly Sunny | 0 to 9 mph NE | 0% |
| Saturday Night | 57°F | Mostly Cloudy | 2 to 7 mph NW | 0% |
| Sunday | 78°F | Partly Sunny | 2 to 7 mph WNW | 3% |
| Sunday Night | 56°F | Mostly Cloudy then Patchy Fog | 1 to 7 mph W | 3% |
| Monday | 81°F | Patchy Fog then Mostly Sunny | 1 to 7 mph W | 0% |
| Monday Night | 56°F | Partly Cloudy | 1 to 7 mph WSW | 0% |
| Tuesday | 84°F | Sunny | 1 to 7 mph WSW | 0% |
| Tuesday Night | 58°F | Mostly Clear | 0 to 7 mph WNW | 0% |
| Wednesday | 92°F | Sunny | 0 to 7 mph NW | 0% |
| Wednesday Night | 62°F | Mostly Clear | 0 to 7 mph NNW | 0% |
| Thursday | 93°F | Sunny | 0 to 7 mph NW | 0% |
| Thursday Night | 62°F | Mostly Clear | 1 to 7 mph W | 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 Sep 19, 2026.