Monte Rio, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monte Rio, a community in Sonoma County, California.
Today
63°F
Patchy Fog then Sunny
Patchy fog between 8am and 10am. Sunny. High near 63, with temperatures falling to around 60 in the afternoon. Northwest wind 1 to 10 mph, with gusts as high as 22 mph.
7-day forecast for Monte Rio
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Patchy Fog then Sunny | 1 to 10 mph NW | 3% |
| Tonight | 49°F | Mostly Cloudy | 5 to 9 mph NW | 2% |
| Thursday | 69°F | Mostly Sunny | 2 to 6 mph NW | 0% |
| Thursday Night | 46°F | Mostly Clear | 2 to 6 mph NNW | 0% |
| Friday | 70°F | Sunny | 0 to 5 mph NNW | 0% |
| Friday Night | 49°F | Mostly Clear | 1 to 5 mph NNW | 0% |
| Saturday | 70°F | Sunny | 0 to 5 mph W | 0% |
| Saturday Night | 49°F | Mostly Clear | 5 mph NW | 0% |
| Sunday | 70°F | Mostly Sunny | 0 to 5 mph NNW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 5 mph NW | 0% |
| Monday | 66°F | Mostly Sunny | 1 to 6 mph NW | 2% |
| Monday Night | 50°F | Partly Cloudy | 2 to 6 mph NW | 3% |
| Tuesday | 67°F | Slight Chance Light Rain | 0 to 5 mph WNW | 15% |
| Tuesday Night | 51°F | Slight Chance Light Rain | 5 mph W | 24% |
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
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El Verano
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Fetters Hot Springs-Agua Caliente
Forestville
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Guerneville
Healdsburg
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Occidental
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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 Nov 4, 2026.