Delavan, WI Weather Forecast
Walworth County, Wisconsin
Seven-day outlook
38–68°F across the weekThe week runs between 38° and 68°, with Tuesday the warmest day of it. There is no real trend across it: one day looks much like the next. Saturday is the wettest day, peaking near 62%. 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 Delavan forecast
Delavan sits at 42.6305°N, 88.6298°W in Walworth 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
- Walworth County
- Coordinates
- 42.6305°N, 88.6298°W
- Population
- 8,523 · 2023 estimate
- Land area
- 7.41 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Delavan, 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 Delavan?
The nearest Doppler radar is KMKX (Milwaukee, WI), 24 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 Delavan its center is about 1,400 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 Delavan, so low-level rotation and the leading edge of a gust front show up on it. Delavan is closer to its radar than 80% of US cities.
The closest instrument actually measuring the air is KBUU · Burlington Muni on the ASOS/AWOS network, 17 miles away. Far enough that "current conditions" for Delavan is an educated reading of somewhere else, worth knowing before you plan around a single temperature.
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 Delavan
- Elkhorn, WI6 mi
- Williams Bay, WI6 mi
- Sugar Creek, WI6 mi
- Walworth, WI7 mi
- Geneva, WI8 mi
- Linn, WI10 mi
- Lake Geneva, WI11 mi
- Lyons, WI14 mi
Elsewhere in Wisconsin
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