McArthur, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McArthur, a community in Shasta County, California.
Tonight
40°F
Clear
Clear. Low around 40, with temperatures rising to around 44 overnight. Southwest wind around 3 mph.
7-day forecast for McArthur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 40°F | Clear | 3 mph SW | 0% |
| Saturday | 81°F | Sunny | 3 mph NNW | 0% |
| Saturday Night | 41°F | Mostly Clear | 5 mph ENE | 0% |
| Sunday | 87°F | Mostly Sunny | 5 mph NW | 0% |
| Sunday Night | 45°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Monday | 85°F | Mostly Sunny | 1 to 5 mph N | 0% |
| Monday Night | 45°F | Mostly Clear | 1 to 5 mph N | 0% |
| Tuesday | 85°F | Sunny | 1 to 7 mph NNW | 0% |
| Tuesday Night | 44°F | Mostly Clear | 0 to 7 mph NNE | 0% |
| Wednesday | 85°F | Sunny | 1 to 8 mph NW | 0% |
| Wednesday Night | 44°F | Mostly Clear | 2 to 8 mph S | 0% |
| Thursday | 85°F | Sunny | 1 to 10 mph S | 0% |
| Thursday Night | 45°F | Partly Cloudy | 2 to 10 mph S | 0% |
| Friday | 80°F | Sunny | 2 to 10 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov) for McArthur (41.042, -121.405). Updated through the day.
Growing snapshot for McArthur
Last spring frost
May 29
First fall frost
Sep 19
Growing season
113 days
Hardiness zone
7b
More local growing data for McArthur: nearby ZIP 96028 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Hat Creek, Ca (6.9 mi from McArthur). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.