St. Helens, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Helens, a city in Columbia County, Oregon.
Overnight
41°F
Mostly Clear
Mostly clear, with a low around 41. Southeast wind around 1 mph.
7-day forecast for St. Helens
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Mostly Clear | 1 mph SE | 2% |
| Wednesday | 57°F | Patchy Fog then Light Rain Likely | 1 to 6 mph SE | 65% |
| Wednesday Night | 46°F | Light Rain | 0 to 3 mph S | 94% |
| Thursday | 57°F | Patchy Fog then Mostly Sunny | 0 to 3 mph SSE | 5% |
| Thursday Night | 44°F | Mostly Cloudy then Chance Light Rain | 2 mph SE | 43% |
| Friday | 56°F | Chance Light Rain | 2 to 6 mph SE | 51% |
| Friday Night | 48°F | Chance Light Rain | 0 to 3 mph SE | 41% |
| Saturday | 63°F | Partly Sunny then Chance Light Rain | 1 to 6 mph SSE | 26% |
| Saturday Night | 50°F | Light Rain | 6 to 13 mph SSE | 77% |
| Sunday | 57°F | Chance Light Rain | 0 to 9 mph S | 41% |
| Sunday Night | 45°F | Slight Chance Light Rain | 1 mph N | 15% |
| Monday | 56°F | Chance Light Rain | 1 to 6 mph ESE | 39% |
| Monday Night | 47°F | Chance Light Rain | 3 to 10 mph SSE | 43% |
| Tuesday | 58°F | Chance Light Rain | 3 to 13 mph SSE | 44% |
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.