Monmouth, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monmouth, a city in Polk County, Oregon.
Tonight
38°F
Areas Of Fog
Areas of fog after 9pm. Mostly clear, with a low around 38. Wind around 0 mph.
7-day forecast for Monmouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 38°F | Areas Of Fog | 0 mph | 3% |
| Wednesday | 57°F | Areas Of Fog then Light Rain Likely | 0 to 6 mph S | 64% |
| Wednesday Night | 46°F | Light Rain then Mostly Cloudy | 2 to 7 mph S | 93% |
| Thursday | 59°F | Mostly Sunny | 0 to 6 mph S | 7% |
| Thursday Night | 44°F | Areas Of Fog then Chance Light Rain | 2 mph S | 37% |
| Friday | 59°F | Chance Light Rain | 1 to 6 mph S | 37% |
| Friday Night | 45°F | Slight Chance Light Rain then Areas Of Fog | 1 mph E | 17% |
| Saturday | 62°F | Areas Of Fog then Slight Chance Light Rain | 0 to 5 mph S | 18% |
| Saturday Night | 49°F | Light Rain Likely | 3 to 17 mph SSW | 61% |
| Sunday | 59°F | Light Rain Likely | 0 to 9 mph SSW | 61% |
| Sunday Night | 44°F | Areas Of Fog | 0 mph | 17% |
| Monday | 58°F | Areas Of Fog | 0 to 5 mph SSE | 44% |
| Monday Night | 46°F | Chance Light Rain | 2 to 7 mph S | 46% |
| Tuesday | 60°F | Chance Light Rain | 2 to 7 mph S | 51% |
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 Nov 4, 2026.