Rio Oso, CA Weather & Growing Conditions
This Afternoon
61°F
Light Rain
Rain before 3pm, then haze and a chance of rain. Mostly cloudy. High near 61, with temperatures falling to around 57 in the afternoon. East wind 2 to 7 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 61°F | Light Rain | 2 to 7 mph E | 87% |
| Tonight | 44°F | Partly Cloudy | 5 mph NNW | 13% |
| Wednesday | 69°F | Sunny | 2 to 8 mph NW | 0% |
| Wednesday Night | 43°F | Areas Of Fog | 2 mph NNE | 0% |
| Thursday | 72°F | Sunny | 5 mph NNW | 0% |
| Thursday Night | 41°F | Mostly Clear then Patchy Fog | 2 mph NNE | 0% |
| Friday | 72°F | Patchy Fog then Sunny | 2 mph N | 0% |
| Friday Night | 44°F | Mostly Clear | 2 mph E | 0% |
| Saturday | 74°F | Sunny | 2 mph NW | 0% |
| Saturday Night | 45°F | Mostly Clear | 1 mph E | 0% |
| Sunday | 73°F | Mostly Sunny | 3 mph NW | 0% |
| Sunday Night | 46°F | Partly Cloudy | 1 mph S | 0% |
| Monday | 72°F | Partly Sunny | 2 mph S | 2% |
| Monday Night | 46°F | Partly Cloudy | 1 mph ENE | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rio Oso, CA
Last spring frost
Feb 11
First fall frost
Nov 30
Growing season
289 days
Hardiness zone
9b
Explore more for Rio Oso, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Marysville Yuba Co Ap, Ca (11.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.