Rancho Cucamonga, CA Weather & Growing Conditions
Overnight
68°F
Mostly Clear
Mostly clear, with a low around 68. East wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Mostly Clear | 0 to 5 mph E | 0% |
| Tuesday | 94°F | Sunny | 0 to 15 mph SW | 0% |
| Tuesday Night | 68°F | Mostly Clear | 0 to 15 mph SW | 0% |
| Wednesday | 93°F | Sunny | 0 to 15 mph S | 0% |
| Wednesday Night | 68°F | Mostly Clear | 0 to 10 mph W | 0% |
| Thursday | 96°F | Sunny | 0 to 10 mph SW | 3% |
| Thursday Night | 69°F | Mostly Clear | 0 to 10 mph W | 3% |
| Friday | 96°F | Sunny | 0 to 10 mph W | 1% |
| Friday Night | 70°F | Mostly Clear | 0 to 10 mph W | 0% |
| Saturday | 97°F | Sunny | 0 to 10 mph SW | 1% |
| Saturday Night | 70°F | Mostly Clear | 0 to 10 mph SW | 1% |
| Sunday | 96°F | Sunny | 0 to 10 mph SW | 1% |
| Sunday Night | 69°F | Mostly Clear | 0 to 10 mph SW | 1% |
| Monday | 92°F | Sunny | 0 to 15 mph SW | 2% |
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 (5.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.