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
47°F
Chance Light Rain
A chance of rain before 4am. Partly cloudy, with a low around 47. North northeast wind around 5 mph. Chance of precipitation is 30%.
7-day forecast for Monte Rio
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Chance Light Rain | 5 mph NNE | 25% |
| Wednesday | 63°F | Patchy Fog then Sunny | 1 to 10 mph NW | 3% |
| Wednesday Night | 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% |
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
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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.