Monmouth, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monmouth, a city in Polk County, Oregon.
Overnight
58°F
Areas Of Smoke
Areas of smoke. Mostly clear, with a low around 58. North wind around 7 mph.
7-day forecast for Monmouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Areas Of Smoke | 7 mph N | 0% |
| Tuesday | 96°F | Areas Of Smoke | 7 to 12 mph N | 0% |
| Tuesday Night | 61°F | Areas Of Smoke | 1 to 10 mph N | 0% |
| Wednesday | 99°F | Areas Of Smoke | 1 to 5 mph N | 0% |
| Wednesday Night | 60°F | Clear | 0 to 3 mph NNW | 0% |
| Thursday | 98°F | Sunny | 0 to 6 mph NNW | 0% |
| Thursday Night | 57°F | Clear | 0 to 6 mph NW | 0% |
| Friday | 94°F | Sunny | 0 to 8 mph N | 0% |
| Friday Night | 58°F | Clear | 2 to 8 mph NNW | 0% |
| Saturday | 89°F | Sunny | 2 to 12 mph NNW | 0% |
| Saturday Night | 54°F | Clear | 2 to 12 mph NW | 0% |
| Sunday | 83°F | Sunny | 2 to 10 mph NNW | 0% |
| Sunday Night | 52°F | Mostly Clear | 2 to 10 mph NNW | 0% |
| Monday | 83°F | Sunny | 2 to 9 mph N | 0% |
Forecast source: National Weather Service (api.weather.gov) for Monmouth (44.851, -123.229). Updated through the day.
Growing snapshot for Monmouth
Last spring frost
Apr 3
First fall frost
Nov 1
Growing season
212 days
Hardiness zone
8b
More local growing data for Monmouth: nearby ZIP 97351 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Salem Mcnary Fld, Or (8.8 mi from Monmouth). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.