Cupertino, CA Weather & Growing Conditions
This Afternoon
83°F
Sunny
Sunny. High near 83, with temperatures falling to around 80 in the afternoon. North wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 83°F | Sunny | 7 mph N | 0% |
| Tonight | 54°F | Partly Cloudy | 1 to 5 mph WNW | 0% |
| Sunday | 76°F | Mostly Cloudy | 1 to 6 mph NNW | 1% |
| Sunday Night | 54°F | Mostly Cloudy | 3 mph W | 1% |
| Monday | 78°F | Mostly Sunny | 1 to 5 mph WSW | 0% |
| Monday Night | 54°F | Partly Cloudy | 0 to 5 mph WSW | 0% |
| Tuesday | 80°F | Sunny | 1 to 5 mph WSW | 0% |
| Tuesday Night | 55°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Wednesday | 89°F | Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 60°F | Mostly Clear | 0 to 5 mph NNW | 0% |
| Thursday | 91°F | Sunny | 0 to 5 mph NW | 0% |
| Thursday Night | 60°F | Mostly Clear | 0 to 5 mph W | 0% |
| Friday | 85°F | Mostly Sunny | 0 to 6 mph W | 0% |
| Friday Night | 56°F | Partly Cloudy | 1 to 6 mph W | 1% |
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 Sep 19, 2026.