Lewiston, ID Weather Forecast
Nez Perce County, Idaho
Seven-day outlook
36–56°F across the weekThe week runs between 36° and 56°, with Wednesday the warmest day of it. There is no real trend across it: one day looks much like the next. Sunday is the wettest day, peaking near 48%. 5 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 Lewiston forecast
Lewiston sits at 46.3931°N, 116.9935°W in Nez Perce County, Idaho. 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
- Nez Perce County
- Coordinates
- 46.3931°N, 116.9935°W
- Population
- 34,836 · 2023 estimate
- Land area
- 17.469 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Lewiston, 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 Lewiston?
The nearest Doppler radar is KOTX (Spokane, WA), 94 miles to the NNW. 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 Lewiston its center is about 8,700 ft above ground. At that range the beam overshoots the layer where severe weather organizes. The radar is describing the middle of the storm, not its base , which is why a warning for Lewiston can look unsupported on the mosaic and still be right. Trust the warning over the picture.
The closest instrument actually measuring the air is KLWS · Lewiston/Nez Perce Cnty on the ASOS/AWOS network, 1.6 miles away. Close enough that its readings are, for practical purposes, the conditions in town.
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 Idaho observing network as of this build.
Forecasts near Lewiston
- Clarkston, WA3 mi
- Moscow, ID23 mi
- Pullman, WA25 mi
- Orofino, ID36 mi
- Colfax, WA39 mi
- Dayton, WA47 mi
- Grangeville, ID53 mi
- Cheney, WA81 mi
Elsewhere in Idaho
Boise CityMeridianNampaCaldwellIdaho FallsPocatelloAll Idaho forecasts →