Clinton, IL Weather Forecast
De Witt County, Illinois
Seven-day outlook
40–77°F across the weekThe week runs between 47° and 76°, with today 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 50%.
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 Clinton forecast
Clinton sits at 40.1470°N, 88.9632°W in De Witt 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
- De Witt County
- Coordinates
- 40.1470°N, 88.9632°W
- Population
- 6,898 · 2023 estimate
- Land area
- 3.544 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Clinton, 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 Clinton?
The nearest Doppler radar is KILX (Lincoln, IL), 20 miles to the W. 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 Clinton its center is about 1,100 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 Clinton, so low-level rotation and the leading edge of a gust front show up on it. Clinton is closer to its radar than 85% of US cities.
The closest instrument actually measuring the air is KAAA · Lincoln/Logan Cnty on the ASOS/AWOS network, 20 miles away. Far enough that "current conditions" for Clinton 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 Illinois observing network as of this build.
Forecasts near Clinton
- Heyworth, IL12 mi
- Forsyth, IL15 mi
- Le Roy, IL17 mi
- Decatur, IL20 mi
- Lincoln, IL22 mi
- Monticello, IL22 mi
- Bloomington, IL23 mi
- Mount Zion, IL25 mi
Elsewhere in Illinois
ChicagoAuroraJolietNapervilleRockfordElginAll Illinois forecasts →