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
59°F
Patchy Smoke
Patchy smoke. Mostly clear. Low around 59, with temperatures rising to around 61 overnight. North northwest wind around 8 mph.
7-day forecast for St. Helens
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Patchy Smoke | 8 mph NNW | 0% |
| Tuesday | 93°F | Areas Of Smoke | 9 mph NNW | 0% |
| Tuesday Night | 64°F | Smoke | 8 mph NNW | 0% |
| Wednesday | 97°F | Areas Of Smoke | 7 mph NNW | 0% |
| Wednesday Night | 64°F | Clear | 3 to 7 mph NNW | 0% |
| Thursday | 96°F | Sunny | 2 to 7 mph NNW | 0% |
| Thursday Night | 61°F | Mostly Clear | 2 to 7 mph NNW | 0% |
| Friday | 90°F | Sunny | 2 to 10 mph NW | 0% |
| Friday Night | 60°F | Mostly Clear | 5 to 10 mph NW | 0% |
| Saturday | 85°F | Sunny | 5 to 12 mph NW | 0% |
| Saturday Night | 57°F | Mostly Clear | 5 to 12 mph NW | 0% |
| Sunday | 79°F | Sunny | 5 to 10 mph NW | 0% |
| Sunday Night | 55°F | Mostly Clear | 3 to 10 mph NW | 0% |
| Monday | 79°F | Sunny | 3 to 9 mph NW | 0% |
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 Aug 4, 2026.