St. Helens, OR Weather Forecast
Columbia County, Oregon
Seven-day outlook
39–57°F across the weekThe week runs between 39° and 57°, with Tuesday the warmest day of it. There is no real trend across it: one day looks much like the next. Today is the wettest day, peaking near 46%. 6 of the 7 days stay dry.
Forecasts come from the National Weather Service's own computer models, and current conditions from the nearest reporting weather station. Both are served through the weather API. A forecast is guidance, not a warning, and anything the Weather Service has actually issued is on the live map.
The written summaries on this page are generated from the forecast data above, not by a meteorologist. Each sentence is a reading of the same numbers you can see, and no forecaster has reviewed them.
About the St. Helens forecast
St. Helens sits at 45.8568°N, 122.8163°W in Columbia County, Oregon. The forecast above is drawn for that point from the National Weather Service's own computer models: a seven-day outlook, and a finer-grained one covering the next eighteen hours where it reaches, and the radar and alert panels show what the Weather Service has out over the area right now.
- County
- Columbia County
- Coordinates
- 45.8568°N, 122.8163°W
- Population
- 14,437 · 2023 estimate
- Land area
- 4.851 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for St. Helens, and the forecast is for that location, not for every address inside the city limits, and a large city can have real weather differences from one side to the other.
How well can the network see St. Helens?
The nearest Doppler radar is KRTX (Portland, OR), 12 miles to the SW. A WSR-88D's lowest routine scan sits half a degree above horizontal, and the earth curves away beneath it, so by the time that beam reaches St. Helens its center is about 630 ft above ground. That is about as close as radar coverage gets in the United States: the lowest scan is still near the ground when it reaches St. Helens, so low-level rotation and the leading edge of a gust front show up on it. St. Helens is closer to its radar than 94% of US cities.
The closest instrument actually measuring the air is KSPB · Scappoose Ind Arpk on the ASOS/AWOS network, 6.5 miles away. Near enough to be representative on most days, though a summer thunderstorm can soak one and miss the other entirely.
Beam height is the standard 4/3-earth approximation for the 0.5° scan and assumes normal refraction; it is where the center of the beam is, not its edges, and unusual temperature profiles bend it. Radar siting from the NWS WSR-88D network, station positions from the Oregon observing network as of this build.
Forecasts near St. Helens
- Woodland, WA5 mi
- Ridgefield, WA6 mi
- La Center, WA7 mi
- Scappoose, OR7 mi
- Kalama, WA11 mi
- Battle Ground, WA14 mi
- Kelso, WA18 mi
- Vancouver, WA19 mi
Elsewhere in Oregon
PortlandEugeneSalemGreshamHillsboroBendAll Oregon forecasts →