Rancho Cucamonga, CA Weather & Growing Conditions
Today
71°F
Sunny
Sunny, with a high near 71. North wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Sunny | 0 to 5 mph N | 2% |
| Tonight | 54°F | Partly Cloudy | 0 to 10 mph NW | 0% |
| Thursday | 75°F | Mostly Sunny | 0 to 10 mph N | 0% |
| Thursday Night | 57°F | Partly Cloudy | 5 to 15 mph N | 0% |
| Friday | 77°F | Sunny | 5 to 15 mph N | 0% |
| Friday Night | 57°F | Clear | 15 to 25 mph N | 0% |
| Saturday | 78°F | Sunny | 5 to 15 mph N | 0% |
| Saturday Night | 58°F | Clear | 5 to 20 mph N | 0% |
| Sunday | 79°F | Sunny | 0 to 10 mph NE | 0% |
| Sunday Night | 60°F | Mostly Clear | 0 to 10 mph N | 0% |
| Monday | 78°F | Sunny | 0 to 5 mph NE | 0% |
| Monday Night | 59°F | Partly Cloudy | 0 mph | 1% |
| Tuesday | 76°F | Sunny | 0 mph | 3% |
| Tuesday Night | 57°F | Mostly Clear | 0 mph | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rancho Cucamonga, CA
Last spring frost
Jan 4
First fall frost
Dec 30
Growing season
365 days
Hardiness zone
10a
Explore more for Rancho Cucamonga, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Ontario Intl Ap, Ca (8.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.