St. Helens, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Helens, a city in Columbia County, Oregon.
This Afternoon
72°F
Sunny
Sunny, with a high near 72. East southeast wind around 2 mph.
7-day forecast for St. Helens
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Sunny | 2 mph ESE | 0% |
| Tonight | 54°F | Mostly Clear | 3 mph NNW | 0% |
| Saturday | 79°F | Partly Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 56°F | Partly Cloudy | 7 mph NNW | 0% |
| Sunday | 81°F | Sunny | 5 to 8 mph NNW | 0% |
| Sunday Night | 55°F | Mostly Clear | 8 mph NW | 0% |
| Monday | 76°F | Mostly Sunny | 5 to 9 mph NW | 0% |
| Monday Night | 55°F | Partly Cloudy | 5 to 9 mph NW | 0% |
| Tuesday | 72°F | Mostly Sunny | 5 to 8 mph NW | 0% |
| Tuesday Night | 53°F | Partly Cloudy | 2 to 8 mph NW | 1% |
| Wednesday | 72°F | Mostly Sunny | 5 mph NNW | 1% |
| Wednesday Night | 54°F | Partly Cloudy | 5 mph NNW | 2% |
| Thursday | 75°F | Mostly Sunny | 5 mph NNW | 9% |
| Thursday Night | 55°F | Slight Chance Light Rain | 5 mph NW | 22% |
Forecast source: National Weather Service (api.weather.gov) for St. Helens (45.857, -122.816). Updated through the day.
Growing snapshot for St. Helens
Last spring frost
Apr 18
First fall frost
Nov 7
Growing season
201 days
Hardiness zone
8b
More local growing data for St. Helens: nearby ZIP 97018 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Saint Helens Rfd, Or (4.5 mi from St. Helens). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.