San Dimas, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Dimas, a city in Los Angeles County, California.
This Afternoon
73°F
Sunny
Sunny, with a high near 73. West northwest wind 0 to 5 mph.
7-day forecast for San Dimas
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Sunny | 0 to 5 mph WNW | 0% |
| Tonight | 55°F | Mostly Clear | 0 to 5 mph NNW | 0% |
| Thursday | 77°F | Sunny | 0 to 5 mph NNE | 0% |
| Thursday Night | 56°F | Clear | 0 to 10 mph N | 0% |
| Friday | 80°F | Sunny | 0 to 10 mph NNE | 0% |
| Friday Night | 57°F | Clear | 0 to 10 mph NNE | 0% |
| Saturday | 81°F | Sunny | 0 to 10 mph NNE | 0% |
| Saturday Night | 58°F | Clear | 0 to 15 mph NNE | 0% |
| Sunday | 83°F | Sunny | 0 to 10 mph ENE | 0% |
| Sunday Night | 61°F | Partly Cloudy | 0 to 15 mph NNE | 0% |
| Monday | 81°F | Mostly Sunny | 0 to 5 mph NE | 0% |
| Monday Night | 60°F | Partly Cloudy | 0 to 5 mph NNE | 0% |
| Tuesday | 80°F | Sunny | 0 to 5 mph S | 0% |
| Tuesday Night | 59°F | Mostly Clear | 0 to 5 mph N | 1% |
Forecast source: National Weather Service (api.weather.gov) for San Dimas (34.108, -117.809). Updated through the day.
Growing snapshot for San Dimas
Last spring frost
Jan 8
First fall frost
Dec 28
Growing season
354 days
Hardiness zone
10a
More local growing data for San Dimas: nearby ZIP 91773 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Pomona/Fairplex, Ca (3 mi from San Dimas). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.