Monroe, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monroe, a city in Benton County, Oregon.
Tonight
39°F
Mostly Clear then Patchy Fog
Patchy fog after 3am. Mostly clear, with a low around 39. South southwest wind around 1 mph.
7-day forecast for Monroe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 39°F | Mostly Clear then Patchy Fog | 1 mph SSW | 1% |
| Wednesday | 60°F | Patchy Fog then Light Rain | 1 to 6 mph SSW | 76% |
| Wednesday Night | 45°F | Light Rain Likely then Mostly Cloudy | 2 to 8 mph S | 60% |
| Thursday | 60°F | Mostly Sunny | 0 to 3 mph S | 9% |
| Thursday Night | 42°F | Mostly Cloudy | 2 mph S | 5% |
| Friday | 61°F | Mostly Cloudy | 1 to 5 mph S | 11% |
| Friday Night | 43°F | Mostly Cloudy | 1 mph SSE | 8% |
| Saturday | 65°F | Partly Sunny then Slight Chance Light Rain | 1 to 5 mph S | 15% |
| Saturday Night | 47°F | Light Rain Likely | 3 to 16 mph SSW | 62% |
| Sunday | 60°F | Light Rain Likely | 0 to 9 mph SW | 62% |
| Sunday Night | 43°F | Areas Of Fog | 1 mph ENE | 20% |
| Monday | 60°F | Chance Light Rain | 1 to 5 mph S | 38% |
| Monday Night | 44°F | Chance Light Rain | 2 to 7 mph S | 38% |
| Tuesday | 62°F | Chance Light Rain | 6 mph S | 45% |
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 Nov 4, 2026.