Monroe, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monroe, a city in Benton County, Oregon.
Overnight
57°F
Smoke
Smoke. Clear. Low around 57, with temperatures rising to around 59 overnight. North northwest wind around 7 mph.
7-day forecast for Monroe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Smoke | 7 mph NNW | 0% |
| Tuesday | 95°F | Areas Of Smoke | 6 to 12 mph N | 0% |
| Tuesday Night | 63°F | Smoke | 2 to 12 mph NNW | 0% |
| Wednesday | 98°F | Smoke | 2 to 6 mph N | 0% |
| Wednesday Night | 59°F | Clear | 0 to 6 mph W | 0% |
| Thursday | 98°F | Sunny | 0 to 8 mph NNW | 0% |
| Thursday Night | 56°F | Clear | 1 to 8 mph WNW | 0% |
| Friday | 93°F | Sunny | 1 to 9 mph NNW | 0% |
| Friday Night | 58°F | Clear | 2 to 9 mph NNW | 0% |
| Saturday | 90°F | Sunny | 2 to 12 mph N | 0% |
| Saturday Night | 54°F | Clear | 3 to 12 mph NNW | 0% |
| Sunday | 84°F | Sunny | 3 to 12 mph N | 0% |
| Sunday Night | 52°F | Mostly Clear | 3 to 12 mph NNW | 0% |
| Monday | 83°F | Sunny | 3 to 10 mph N | 0% |
Forecast source: National Weather Service (api.weather.gov) for Monroe (44.317, -123.299). Updated through the day.
Growing snapshot for Monroe
Last spring frost
Apr 11
First fall frost
Oct 30
Growing season
203 days
Hardiness zone
8b
More local growing data for Monroe: nearby ZIP 97456 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Corvallis 10 Ssw, Or (5.4 mi from Monroe). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.