Weather forecast for: Decatur IL
Last Update: 6:36 am CDT Oct 8, 2026
Today: Sunny, with a high near 81. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Tonight: Mostly clear, with a low around 53. Light and variable wind becoming southeast around 6 mph after midnight.
Friday: Sunny, with a high near 86. South wind 6 to 11 mph, with gusts as high as 18 mph.
Friday Night: Clear, with a low around 61. South southeast wind around 9 mph, with gusts as high as 15 mph.
Saturday: Increasing clouds, with a high near 85. South wind 8 to 11 mph, with gusts as high as 17 mph.
Saturday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 60. East southeast wind 8 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday: A 30 percent chance of showers before 1pm. Partly sunny, with a high near 75. East wind 7 to 11 mph becoming north northwest in the afternoon.
Sunday Night: Mostly clear, with a low around 57.
Columbus Day: Sunny, with a high near 87.
Monday Night: Mostly clear, with a low around 60.
Tuesday: Sunny, with a high near 76.
Tuesday Night: Mostly clear, with a low around 49.
Wednesday: Sunny, with a high near 72.
WeatherWorld.com
City of Decatur, Illinois
