Hilmar-Irwin, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Hilmar-Irwin, a community in Merced County, California.

Tonight

47°F

Partly Cloudy

Partly cloudy. Low around 47, with temperatures rising to around 49 overnight. North northwest wind 0 to 10 mph, with gusts as high as 20 mph. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Hilmar-Irwin

When	Temp	Forecast	Wind	Precip
Tonight	47°F	Partly Cloudy	0 to 10 mph NNW	9%
Wednesday	69°F	Sunny	5 to 10 mph NW	0%
Wednesday Night	46°F	Partly Cloudy	0 to 5 mph NW	0%
Thursday	71°F	Sunny	0 to 10 mph NW	0%
Thursday Night	44°F	Clear	0 to 5 mph NNW	0%
Friday	72°F	Sunny	0 to 5 mph NNW	0%
Friday Night	46°F	Mostly Clear	0 to 5 mph N	0%
Saturday	75°F	Sunny	0 to 5 mph ESE	0%
Saturday Night	48°F	Mostly Clear	0 mph	0%
Sunday	75°F	Sunny	0 to 5 mph N	0%
Sunday Night	49°F	Partly Cloudy	0 to 5 mph NNW	0%
Monday	74°F	Mostly Sunny	0 to 5 mph NNW	1%
Monday Night	48°F	Partly Cloudy	0 to 5 mph NNW	1%
Tuesday	74°F	Sunny	0 to 5 mph NNW	3%

Forecast source: National Weather Service (api.weather.gov) for Hilmar-Irwin (37.405, -120.850). Updated through the day.

Growing snapshot for Hilmar-Irwin

Last spring frost

Jan 6

First fall frost

Dec 20

Growing season

351 days

Hardiness zone

More local growing data for Hilmar-Irwin: nearby ZIP 95324 weather · frost dates · planting calendar · California frost dates

Nearby towns & communities

Atwater Ballico Bear Creek Cressey Delhi Dos Palos Dos Palos Y El Nido Franklin Gustine Le Grand Livingston Los Banos McSwain Merced Planada Santa Nella Snelling South Dos Palos Stevinson Tuttle University of California-Merced Volta Winton

All California locations ›

Climate data from the nearest NOAA station, Turlock #2, Ca (8.1 mi from Hilmar-Irwin). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.