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.

Today

95°F

Sunny

Sunny, with a high near 95. Southwest wind 0 to 15 mph, with gusts as high as 25 mph.

7-day forecast for Rancho Cucamonga

When	Temp	Forecast	Wind	Precip
Today	95°F	Sunny	0 to 15 mph SW	0%
Tonight	68°F	Mostly Clear	0 to 15 mph SW	0%
Wednesday	95°F	Sunny	0 to 15 mph SW	0%
Wednesday Night	68°F	Mostly Clear	0 to 10 mph SW	0%
Thursday	97°F	Sunny	0 to 10 mph SW	2%
Thursday Night	69°F	Mostly Clear	0 to 10 mph W	2%
Friday	96°F	Sunny	0 to 10 mph W	0%
Friday Night	70°F	Mostly Clear	0 to 10 mph W	0%
Saturday	99°F	Sunny	0 to 10 mph SW	1%
Saturday Night	70°F	Mostly Clear	0 to 10 mph SW	0%
Sunday	97°F	Sunny	0 to 10 mph SW	1%
Sunday Night	69°F	Mostly Clear	0 to 10 mph SW	1%
Monday	93°F	Sunny	0 to 15 mph SW	2%
Monday Night	66°F	Mostly Clear	0 to 15 mph SW	2%

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 Aug 4, 2026.