McArthur, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McArthur, a community in Shasta County, California.
Tonight
28°F
Haze
Haze and areas of fog before 1am, then areas of fog and patchy frost between 1am and 4am, then areas of frost and patchy fog. Mostly cloudy. Low around 28, with temperatures rising to around 33 overnight. East southeast wind around 1 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for McArthur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 28°F | Haze | 1 mph ESE | 7% |
| 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 | 67°F | Sunny | 0 to 3 mph N | 0% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 5 mph SSE | 0% |
| Sunday | 62°F | Mostly Sunny | 2 mph SE | 0% |
| Sunday Night | 30°F | Mostly Cloudy | 0 to 3 mph ESE | 1% |
| Monday | 60°F | Partly Sunny | 2 mph SW | 4% |
| Monday Night | 29°F | Partly Cloudy | 0 to 5 mph SE | 5% |
| Tuesday | 61°F | Mostly Sunny then Slight Chance Light Rain | 2 mph SE | 15% |
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 4, 2026.