O'Brien, OR Weather & Growing Conditions
Tonight
45°F
Clear
Clear. Low around 45, with temperatures rising to around 47 overnight. South southwest wind 0 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 45°F | Clear | 0 to 8 mph SSW | 0% |
| Saturday | 84°F | Sunny | 0 to 9 mph WNW | 0% |
| Saturday Night | 47°F | Partly Cloudy | 1 to 9 mph ESE | 0% |
| Sunday | 86°F | Mostly Sunny | 1 to 6 mph N | 0% |
| Sunday Night | 47°F | Mostly Clear | 2 to 6 mph NE | 0% |
| Monday | 84°F | Sunny | 2 to 6 mph NNE | 0% |
| Monday Night | 46°F | Mostly Clear | 3 to 8 mph NE | 0% |
| Tuesday | 81°F | Sunny | 5 mph NNE | 0% |
| Tuesday Night | 43°F | Mostly Clear | 3 to 7 mph NE | 0% |
| Wednesday | 82°F | Sunny | 3 mph NNE | 0% |
| Wednesday Night | 47°F | Mostly Clear | 1 to 5 mph NE | 0% |
| Thursday | 83°F | Sunny | 1 to 5 mph NW | 3% |
| Thursday Night | 46°F | Partly Cloudy | 5 mph ESE | 6% |
| Friday | 73°F | Mostly Sunny | 2 to 6 mph NNE | 9% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for O'Brien, OR
Last spring frost
May 1
First fall frost
Oct 12
Growing season
161 days
Hardiness zone
8b
Explore more for O'Brien, OR: full frost dates · planting calendar · Oregon frost dates
Climate data from the nearest NOAA station, Cave Junction 1 Wnw, Or (10.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.