Monte Rio, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Monte Rio, a community in Sonoma County, California.

Overnight

53°F

Haze

Haze. Mostly clear, with a low around 53. South southwest wind around 1 mph.

7-day forecast for Monte Rio

When	Temp	Forecast	Wind	Precip
Overnight	53°F	Haze	1 mph SSW	0%
Tuesday	82°F	Haze then Sunny	1 to 8 mph SSW	1%
Tuesday Night	52°F	Patchy Fog	1 to 5 mph SSW	1%
Wednesday	77°F	Patchy Fog then Mostly Sunny	1 to 7 mph SSW	0%
Wednesday Night	52°F	Areas Of Fog	0 to 6 mph WSW	0%
Thursday	76°F	Areas Of Fog then Sunny	0 to 7 mph WSW	0%
Thursday Night	53°F	Patchy Fog	0 to 7 mph WNW	0%
Friday	85°F	Sunny	0 to 7 mph WSW	0%
Friday Night	56°F	Mostly Clear	0 to 7 mph WNW	0%
Saturday	86°F	Sunny	0 to 7 mph WNW	0%
Saturday Night	59°F	Mostly Clear	3 to 7 mph WNW	0%
Sunday	86°F	Sunny	2 to 8 mph WNW	0%
Sunday Night	55°F	Mostly Clear	2 to 8 mph WNW	0%
Monday	77°F	Sunny	1 to 8 mph SW	0%

Forecast source: National Weather Service (api.weather.gov) for Monte Rio (38.474, -123.026). Updated through the day.

Growing snapshot for Monte Rio

Last spring frost

Jan 29

First fall frost

Dec 30

Growing season

347 days

Hardiness zone

More local growing data for Monte Rio: nearby ZIP 95486 weather · frost dates · planting calendar · California frost dates

Nearby towns & communities

Bloomfield Bodega Bodega Bay Boyes Hot Springs Calistoga Carmet Cazadero Cloverdale Cotati El Verano Eldridge Fetters Hot Springs-Agua Caliente Forestville Fulton Geyserville Glen Ellen Graton Guerneville Healdsburg Jenner Kenwood Larkfield-Wikiup Occidental Penngrove Petaluma Rohnert Park Salmon Creek Santa Rosa Sea Ranch Sebastopol

All California locations ›

Climate data from the nearest NOAA station, Occidental, Ca (6.9 mi from Monte Rio). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.