Rancho Cucamonga, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Rancho Cucamonga, a city in San Bernardino County, California.

This Afternoon

71°F

Mostly Sunny

Mostly sunny, with a high near 71. Southwest wind 5 to 10 mph.

7-day forecast for Rancho Cucamonga

When	Temp	Forecast	Wind	Precip
This Afternoon	71°F	Mostly Sunny	5 to 10 mph SW	0%
Tonight	53°F	Mostly Clear	0 to 5 mph W	0%
Wednesday	72°F	Sunny	0 to 5 mph W	0%
Wednesday Night	55°F	Mostly Clear	0 to 5 mph NW	0%
Thursday	76°F	Sunny	0 to 5 mph E	0%
Thursday Night	56°F	Mostly Clear	0 to 15 mph N	0%
Friday	79°F	Sunny	5 to 10 mph N	0%
Friday Night	57°F	Clear	5 to 20 mph N	0%
Saturday	81°F	Sunny	0 to 10 mph NE	0%
Saturday Night	59°F	Clear	0 to 20 mph N	0%
Sunday	82°F	Sunny	0 to 5 mph NE	0%
Sunday Night	61°F	Partly Cloudy	0 to 10 mph N	0%
Monday	80°F	Mostly Sunny	0 to 5 mph NE	0%
Monday Night	60°F	Partly Cloudy	0 mph	1%

Forecast source: National Weather Service (api.weather.gov) for Rancho Cucamonga (34.130, -117.566). Updated through the day.

Growing snapshot for Rancho Cucamonga

Last spring frost

Jan 4

First fall frost

Dec 30

Growing season

365 days

Hardiness zone

10a

More local growing data for Rancho Cucamonga: nearby ZIP 91737 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, Ontario Intl Ap, Ca (7 mi from Rancho Cucamonga). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.