Monmouth, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monmouth, a city in Polk County, Oregon.
This Afternoon
73°F
Sunny
Sunny, with a high near 73. Southwest wind around 2 mph.
7-day forecast for Monmouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Sunny | 2 mph SW | 0% |
| Tonight | 50°F | Mostly Clear then Patchy Fog | 1 mph NNW | 0% |
| Saturday | 78°F | Patchy Fog then Partly Sunny | 3 mph N | 0% |
| Saturday Night | 52°F | Partly Cloudy then Patchy Fog | 3 mph NNW | 0% |
| Sunday | 82°F | Patchy Fog then Sunny | 1 to 5 mph N | 0% |
| Sunday Night | 52°F | Mostly Clear then Patchy Fog | 0 to 5 mph NNW | 0% |
| Monday | 77°F | Patchy Fog then Mostly Sunny | 0 to 5 mph N | 0% |
| Monday Night | 51°F | Partly Cloudy then Patchy Fog | 1 to 5 mph NNW | 0% |
| Tuesday | 74°F | Patchy Fog then Mostly Sunny | 1 to 5 mph NNW | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Wednesday | 72°F | Mostly Sunny | 0 to 5 mph N | 0% |
| Wednesday Night | 51°F | Partly Cloudy | 0 to 3 mph N | 1% |
| Thursday | 75°F | Mostly Sunny | 0 to 3 mph N | 6% |
| Thursday Night | 52°F | Slight Chance Light Rain | 0 to 3 mph NW | 19% |
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 Sep 18, 2026.