Thermalito, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thermalito, a community in Butte County, California.
Tonight
44°F
Areas Of Fog
Areas of fog before 1am. Mostly clear, with a low around 44. North northwest wind 0 to 8 mph.
7-day forecast for Thermalito
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Areas Of Fog | 0 to 8 mph NNW | 0% |
| Wednesday | 69°F | Sunny | 0 to 10 mph NW | 1% |
| Wednesday Night | 44°F | Partly Cloudy | 0 to 5 mph NNE | 2% |
| Thursday | 73°F | Sunny | 3 to 8 mph NNW | 0% |
| Thursday Night | 45°F | Mostly Clear | 0 to 3 mph NNE | 0% |
| Friday | 71°F | Sunny | 0 to 3 mph ENE | 0% |
| Friday Night | 46°F | Mostly Clear | 1 mph ENE | 0% |
| Saturday | 73°F | Sunny | 2 mph ESE | 0% |
| Saturday Night | 47°F | Mostly Clear | 1 mph ENE | 0% |
| Sunday | 73°F | Mostly Sunny | 3 mph WNW | 0% |
| Sunday Night | 47°F | Partly Cloudy | 2 mph ENE | 0% |
| Monday | 72°F | Mostly Sunny | 2 mph SSW | 1% |
| Monday Night | 47°F | Partly Cloudy | 2 mph NNE | 1% |
| Tuesday | 71°F | Sunny then Slight Chance Light Rain | 3 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Thermalito (39.509, -121.601). Updated through the day.
Growing snapshot for Thermalito
Last spring frost
Jan 30
First fall frost
Dec 13
Growing season
321 days
Hardiness zone
9b
More local growing data for Thermalito: nearby ZIP 95965 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
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Climate data from the nearest NOAA station, Oroville, Ca (5.5 mi from Thermalito). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.