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
62°F
Partly Sunny
Partly sunny. High near 62, with temperatures falling to around 57 in the afternoon. North wind around 1 mph.
7-day forecast for St. Helens
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 62°F | Partly Sunny | 1 mph N | 6% |
| Tonight | 41°F | Mostly Clear | 0 mph | 5% |
| Wednesday | 57°F | Patchy Fog then Light Rain Likely | 0 to 5 mph SSE | 56% |
| Wednesday Night | 47°F | Light Rain | 0 to 5 mph SSE | 95% |
| Thursday | 57°F | Patchy Fog then Partly Sunny | 0 to 5 mph SSE | 19% |
| Thursday Night | 47°F | Light Rain Likely | 0 to 5 mph SE | 70% |
| Friday | 57°F | Light Rain Likely | 2 to 7 mph SE | 70% |
| Friday Night | 48°F | Chance Light Rain | 2 mph SSE | 25% |
| Saturday | 63°F | Partly Sunny then Slight Chance Light Rain | 1 to 6 mph SSE | 19% |
| Saturday Night | 50°F | Light Rain Likely | 6 to 13 mph SSE | 66% |
| Sunday | 59°F | Light Rain Likely | 1 to 10 mph SSW | 66% |
| Sunday Night | 46°F | Mostly Cloudy then Slight Chance Light Rain | 1 mph NNE | 21% |
| Monday | 57°F | Chance Light Rain | 1 to 6 mph ESE | 48% |
| Monday Night | 48°F | Light Rain Likely | 3 to 10 mph SSE | 60% |
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 Nov 4, 2026.