Rio Oso, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rio Oso, a community in Sutter County, California.
Today
90°F
Sunny
Sunny, with a high near 90. South southwest wind around 3 mph.
7-day forecast for Rio Oso
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Sunny | 3 mph SSW | 0% |
| Tonight | 57°F | Partly Cloudy | 5 mph SSE | 0% |
| Sunday | 85°F | Partly Sunny | 3 mph S | 0% |
| Sunday Night | 56°F | Mostly Cloudy | 3 mph SSE | 0% |
| Monday | 87°F | Sunny | 2 to 6 mph S | 0% |
| Monday Night | 55°F | Mostly Clear | 3 to 7 mph SSE | 0% |
| Tuesday | 87°F | Sunny | 5 mph S | 0% |
| Tuesday Night | 56°F | Clear | 1 to 5 mph SSE | 0% |
| Wednesday | 91°F | Sunny | 3 mph SSW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 2 mph SSE | 0% |
| Thursday | 94°F | Sunny | 3 mph SSW | 0% |
| Thursday Night | 59°F | Mostly Clear | 3 mph SSE | 0% |
| Friday | 90°F | Sunny | 5 mph SSE | 1% |
| Friday Night | 57°F | Partly Cloudy | 5 mph SSE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Rio Oso (38.952, -121.531). Updated through the day.
Growing snapshot for Rio Oso
Last spring frost
Feb 11
First fall frost
Nov 30
Growing season
289 days
Hardiness zone
9b
More local growing data for Rio Oso: nearby ZIP 95674 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Marysville Yuba Co Ap, Ca (11.2 mi from Rio Oso). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.