Monte Rio, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monte Rio, a community in Sonoma County, California.
This Afternoon
74°F
Sunny
Sunny. High near 74, with temperatures falling to around 71 in the afternoon. West southwest wind around 9 mph, with gusts as high as 18 mph.
7-day forecast for Monte Rio
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Sunny | 9 mph WSW | 0% |
| Tonight | 54°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Saturday | 77°F | Sunny | 1 to 9 mph SSW | 0% |
| Saturday Night | 54°F | Partly Cloudy | 2 to 7 mph WNW | 0% |
| Sunday | 72°F | Partly Sunny | 1 to 8 mph W | 0% |
| Sunday Night | 53°F | Patchy Fog | 1 to 7 mph W | 0% |
| Monday | 73°F | Areas Of Fog then Mostly Sunny | 1 to 7 mph W | 0% |
| Monday Night | 54°F | Patchy Fog | 1 to 7 mph WNW | 0% |
| Tuesday | 76°F | Patchy Fog then Sunny | 0 to 7 mph W | 0% |
| Tuesday Night | 54°F | Mostly Clear | 1 to 7 mph NNW | 0% |
| Wednesday | 82°F | Sunny | 0 to 6 mph WNW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 1 to 6 mph NW | 0% |
| Thursday | 83°F | Sunny | 0 to 7 mph W | 0% |
| Thursday Night | 58°F | Partly Cloudy | 2 to 7 mph WNW | 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
9b
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
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 Sep 19, 2026.