Alum Rock, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alum Rock, a community in Santa Clara County, California.
Overnight
62°F
Clear
Clear, with a low around 62. West southwest wind around 2 mph.
7-day forecast for Alum Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Clear | 2 mph WSW | 0% |
| Tuesday | 95°F | Sunny | 2 to 7 mph W | 0% |
| Tuesday Night | 62°F | Mostly Clear | 1 to 6 mph W | 0% |
| Wednesday | 93°F | Sunny | 1 to 7 mph W | 0% |
| Wednesday Night | 61°F | Mostly Clear | 0 to 7 mph WSW | 0% |
| Thursday | 91°F | Sunny | 0 to 7 mph WSW | 0% |
| Thursday Night | 63°F | Mostly Clear | 1 to 7 mph WNW | 0% |
| Friday | 95°F | Sunny | 1 to 8 mph WNW | 0% |
| Friday Night | 66°F | Mostly Clear | 0 to 8 mph WNW | 0% |
| Saturday | 95°F | Sunny | 0 to 8 mph W | 0% |
| Saturday Night | 66°F | Mostly Clear | 1 to 8 mph W | 0% |
| Sunday | 91°F | Sunny | 1 to 8 mph W | 0% |
| Sunday Night | 61°F | Mostly Clear | 3 to 8 mph WSW | 0% |
| Monday | 86°F | Sunny | 3 to 8 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Alum Rock (37.369, -121.824). Updated through the day.
Growing snapshot for Alum Rock
Last spring frost
Jan 2
First fall frost
Dec 25
Growing season
362 days
Hardiness zone
9b
More local growing data for Alum Rock: nearby ZIP 95116 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, San Jose, Ca (2.8 mi from Alum Rock). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.