Onalaska, WI Weather Forecast
La Crosse County, Wisconsin
Seven-day outlook
38–65°F across the weekThe week runs between 38° and 65°, with Sunday the warmest day of it. There is no real trend across it: one day looks much like the next. Tuesday is the wettest day, peaking near 64%. 3 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 Onalaska forecast
Onalaska sits at 43.8897°N, 91.2044°W in La Crosse County, Wisconsin. 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
- La Crosse County
- Coordinates
- 43.8897°N, 91.2044°W
- Population
- 19,018 · 2023 estimate
- Land area
- 10.612 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Onalaska, 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 Onalaska?
The nearest Doppler radar is KARX (La Crosse, WI), 4.7 miles to the S. 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 Onalaska its center is about 230 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 Onalaska, so low-level rotation and the leading edge of a gust front show up on it. Onalaska is closer to its radar than 99% of US cities.
The closest instrument actually measuring the air is KLSE · La Crosse Muni on the ASOS/AWOS network, 2.5 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 Wisconsin observing network as of this build.
Forecasts near Onalaska
- Campbell, WI4 mi
- La Crosse, WI5 mi
- West Salem, WI6 mi
- Holmen, WI6 mi
- La Crescent, MN7 mi
- Shelby, WI8 mi
- Holland, WI10 mi
- Sparta, WI20 mi
Elsewhere in Wisconsin
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