McArthur, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McArthur, a community in Shasta County, California.
Today
49°F
Light Rain Likely
Rain likely before 5pm, then patchy fog. Mostly cloudy. High near 49, with temperatures falling to around 45 in the afternoon. Northwest wind 1 to 7 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for McArthur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Light Rain Likely | 1 to 7 mph NW | 60% |
| Tonight | 28°F | Haze | 1 mph ESE | 10% |
| Wednesday | 55°F | Widespread Frost then Mostly Sunny | 2 mph N | 0% |
| Wednesday Night | 28°F | Partly Cloudy then Widespread Frost | 2 mph ENE | 0% |
| Thursday | 58°F | Widespread Frost then Sunny | 2 mph NE | 0% |
| Thursday Night | 27°F | Widespread Frost | 1 to 5 mph ENE | 0% |
| Friday | 64°F | Widespread Frost then Mostly Sunny | 2 mph NE | 0% |
| Friday Night | 30°F | Mostly Clear | 0 to 8 mph ENE | 0% |
| Saturday | 66°F | Sunny | 0 to 3 mph N | 0% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 5 mph SE | 0% |
| Sunday | 62°F | Mostly Sunny | 2 mph SE | 0% |
| Sunday Night | 31°F | Mostly Cloudy | 0 to 3 mph ESE | 0% |
| Monday | 60°F | Partly Sunny | 2 mph SSW | 4% |
| Monday Night | 29°F | Partly Cloudy | 0 to 5 mph SE | 4% |
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 Nov 3, 2026.