La Grange, IL Weather Forecast
Cook County, Illinois
Seven-day outlook
45–70°F across the weekThe week runs between 47° and 70°, with Tuesday the warmest day of it. The second half leans warming, and today is the coolest day in it. Saturday is the wettest day, peaking near 59%. 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 La Grange forecast
La Grange sits at 41.8072°N, 87.8741°W in Cook County, Illinois. 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
- Cook County
- Coordinates
- 41.8072°N, 87.8741°W
- Population
- 15,667 · 2023 estimate
- Land area
- 2.525 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for La Grange, 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 La Grange?
The nearest Doppler radar is KLOT (Chicago, IL), 18 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 La Grange its center is about 970 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 La Grange, so low-level rotation and the leading edge of a gust front show up on it. La Grange is closer to its radar than 88% of US cities.
The closest instrument actually measuring the air is KMDW · Chicago/Midway Intl on the ASOS/AWOS network, 6.3 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 Illinois observing network as of this build.
Forecasts near La Grange
- Western Springs, IL1 mi
- La Grange Park, IL2 mi
- Brookfield, IL2 mi
- Countryside, IL2 mi
- Hinsdale, IL3 mi
- Lyons, IL3 mi
- Indian Head Park, IL3 mi
- Westchester, IL3 mi
Elsewhere in Illinois
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