Salmon, ID Weather Forecast
Lemhi County, Idaho
Seven-day outlook
25–52°F across the weekThe week runs between 25° and 52°, with tomorrow 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 86%. 4 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 Salmon forecast
Salmon sits at 45.1744°N, 113.8948°W in Lemhi 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
- Lemhi County
- Coordinates
- 45.1744°N, 113.8948°W
- Population
- 3,295 · 2023 estimate
- Land area
- 2.509 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Salmon, 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 Salmon?
The nearest Doppler radar is KMSX (Missoula, MT), 129 miles to the N. 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 Salmon its center is about 14,300 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 Salmon can look unsupported on the mosaic and still be right. Trust the warning over the picture.
The closest instrument actually measuring the air is KSMN · Salmon/Lemhi Cnty on the ASOS/AWOS network, 3.2 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 Salmon
- Dillon, MT61 mi
- Anaconda-Deer Lodge County, MT73 mi
- Hamilton, MT76 mi
- Butte, MT78 mi
- Deer Lodge, MT101 mi
- Ketchum, ID105 mi
- Hailey, ID117 mi
- Missoula, MT118 mi
Elsewhere in Idaho
Boise CityMeridianNampaCaldwellIdaho FallsPocatelloAll Idaho forecasts →