Hilmar-Irwin, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hilmar-Irwin, a community in Merced County, California.
Overnight
65°F
Clear
Clear. Low around 65, with temperatures rising to around 67 overnight. Northwest wind around 5 mph.
7-day forecast for Hilmar-Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Clear | 5 mph NW | 0% |
| Tuesday | 102°F | Sunny | 5 mph NW | 0% |
| Tuesday Night | 64°F | Clear | 5 mph NW | 0% |
| Wednesday | 100°F | Sunny | 5 mph NW | 0% |
| Wednesday Night | 64°F | Clear | 5 mph NW | 0% |
| Thursday | 100°F | Sunny | 5 to 10 mph NW | 0% |
| Thursday Night | 65°F | Clear | 5 to 10 mph NW | 0% |
| Friday | 101°F | Sunny | 5 to 10 mph NW | 0% |
| Friday Night | 66°F | Clear | 5 to 10 mph NW | 0% |
| Saturday | 102°F | Sunny | 5 to 10 mph NW | 0% |
| Saturday Night | 66°F | Mostly Clear | 0 to 10 mph NW | 0% |
| Sunday | 100°F | Sunny | 0 to 10 mph NW | 0% |
| Sunday Night | 63°F | Mostly Clear | 0 to 10 mph WNW | 0% |
| Monday | 96°F | Sunny | 0 to 10 mph WNW | 0% |
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
9a
More local growing data for Hilmar-Irwin: nearby ZIP 95324 weather · frost dates · planting calendar · California frost dates
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University of California-Merced
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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 Aug 4, 2026.