Weather World
City of Decatur, IllinoisDecatur, IL 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Decatur, IL Weather Forecast
Decatur, IL Weather Forecast Date: 127 PM CDT Wed Oct 14 2026
The area/counties/county of: Macon, including the city of Decatur.or toggle through each period.
This Afternoon... Mostly cloudy with a 20% chance of showers. Cooler. Near steady temperature in the upper 70s. North winds 5 to 10 mph.
Tonight... Mostly cloudy. A slight chance of showers after midnight. Lows around 60. Northeast winds 10 to 15 mph. Chance of rain 20%.
Thursday... Showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the mid 70s. East winds 5 to 10 mph, becoming south with gusts up to 20 mph in the afternoon. Chance of rain near 100%.
Thursday Night... A chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Breezy, cooler with lows in the upper 40s. West winds 10 to 15 mph, becoming northwest 15 to 25 mph after midnight. Chance of rain 50%.
Friday... Partly sunny. A chance of showers in the afternoon. Breezy and much cooler. Less humid with highs in the upper 50s. Northwest winds 20 to 25 mph with gusts up to 35 mph. Chance of rain 30%.
Friday Night... Partly cloudy in the evening, then clearing. Cooler with lows in the upper 30s.
Saturday... Patchy frost in the morning. Sunny. Highs around 60.
Saturday Night... Clear. Lows in the mid 30s.
Sunday... Areas of frost in the morning. Sunny. Highs in the upper 60s.
Sunday Night... Mostly clear. Lows around 40.
Monday... Partly cloudy. Highs in the mid 70s. Lows in the lower 40s.
POP = Probability of Precipitation
Decatur Radar Loop
Use the map search tool if you want to place a location marker on the radar map...