Fontana, CA Weather & Growing Conditions
This Afternoon
87°F
Sunny
Sunny, with a high near 87. Southwest wind around 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 87°F | Sunny | 10 mph SW | 0% |
| Tonight | 65°F | Partly Cloudy | 0 to 10 mph W | 0% |
| Sunday | 85°F | Mostly Sunny | 0 to 10 mph W | 0% |
| Sunday Night | 64°F | Partly Cloudy | 5 to 10 mph SW | 2% |
| Monday | 80°F | Sunny | 0 to 10 mph SW | 2% |
| Monday Night | 62°F | Mostly Clear | 0 to 10 mph W | 1% |
| Tuesday | 83°F | Sunny | 0 to 5 mph SW | 0% |
| Tuesday Night | 65°F | Clear | 0 to 5 mph W | 0% |
| Wednesday | 92°F | Sunny | 0 to 10 mph W | 0% |
| Wednesday Night | 68°F | Clear | 0 to 10 mph NW | 1% |
| Thursday | 94°F | Sunny | 0 to 10 mph W | 2% |
| Thursday Night | 69°F | Mostly Clear | 0 to 10 mph W | 1% |
| Friday | 91°F | Sunny | 0 to 5 mph SW | 3% |
| Friday Night | 68°F | Mostly Clear | 0 to 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fontana, CA
Last spring frost
Jan 4
First fall frost
Dec 30
Growing season
365 days
Hardiness zone
10a
Explore more for Fontana, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Ontario Intl Ap, Ca (8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.