62521 Weather (Decatur, IL)

Weather forecast for: Decatur IL

Last Update: 10:36 am CDT Aug 17, 2026

Today: Sunny, with a high near 81. North northwest wind 8 to 11 mph, with gusts as high as 17 mph.

Tonight: Partly cloudy, with a low around 61. North northwest wind around 6 mph becoming calm in the evening.

Tuesday: Mostly sunny, with a high near 83. Calm wind becoming southwest around 6 mph in the afternoon.

Tuesday Night: Showers likely after 1am. Increasing clouds, with a low around 67. South wind 3 to 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday: Showers likely before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Mostly cloudy, with a high near 81. Light and variable wind becoming north northwest around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: Partly cloudy, with a low around 64. Northeast wind 3 to 5 mph.

Thursday: Partly sunny, with a high near 80. East northeast wind 5 to 7 mph.

Thursday Night: Partly cloudy, with a low around 61.

Friday: Mostly sunny, with a high near 81.

Friday Night: Mostly clear, with a low around 62.

Saturday: Mostly sunny, with a high near 81.

Saturday Night: Mostly clear, with a low around 62.

Sunday: Sunny, with a high near 79.