Monroe, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monroe, a city in Benton County, Oregon.
This Afternoon
73°F
Sunny
Sunny, with a high near 73. North wind around 2 mph.
7-day forecast for Monroe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Sunny | 2 mph N | 0% |
| Tonight | 49°F | Mostly Clear | 0 to 3 mph NW | 0% |
| Saturday | 78°F | Patchy Fog then Mostly Sunny | 0 to 5 mph N | 0% |
| Saturday Night | 50°F | Mostly Clear | 1 to 5 mph NNW | 0% |
| Sunday | 81°F | Patchy Fog then Sunny | 1 to 6 mph NNW | 0% |
| Sunday Night | 50°F | Mostly Clear | 0 to 6 mph NW | 0% |
| Monday | 77°F | Patchy Fog then Mostly Sunny | 0 to 7 mph N | 0% |
| Monday Night | 50°F | Partly Cloudy | 1 to 7 mph NNW | 0% |
| Tuesday | 74°F | Patchy Fog then Mostly Sunny | 1 to 7 mph N | 0% |
| Tuesday Night | 48°F | Partly Cloudy | 1 to 7 mph NNW | 0% |
| Wednesday | 73°F | Mostly Sunny | 1 to 6 mph N | 0% |
| Wednesday Night | 49°F | Partly Cloudy | 1 to 6 mph N | 0% |
| Thursday | 75°F | Mostly Sunny | 1 to 5 mph N | 6% |
| Thursday Night | 50°F | Slight Chance Light Rain | 5 mph WNW | 20% |
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 Sep 19, 2026.