61951 Weather (Sullivan, IL)

Weather forecast for: Sullivan IL

Last Update: 9:31 am CDT Sep 14, 2026

Today: Mostly sunny, with a high near 82. East southeast wind 10 to 13 mph, with gusts as high as 18 mph.

Tonight: Mostly clear, with a low around 67. Southeast wind around 10 mph, with gusts as high as 18 mph.

Tuesday: A chance of showers, with thunderstorms also possible after 4pm. Mostly sunny and hot, with a high near 95. Heat index values as high as 101. Southwest wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.

Tuesday Night: A chance of showers and thunderstorms, then showers likely after 10pm. Mostly cloudy, with a low around 68. Light and variable wind becoming east around 5 mph after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday: A 40 percent chance of showers before 1pm. Mostly sunny, with a high near 92. East wind around 6 mph becoming south in the afternoon.

Wednesday Night: Partly cloudy, with a low around 72. South southeast wind 3 to 6 mph.

Thursday: Mostly sunny, with a high near 93. Southwest wind 6 to 8 mph becoming west northwest in the afternoon.

Thursday Night: Partly cloudy, with a low around 68.

Friday: Mostly sunny, with a high near 90.

Friday Night: Partly cloudy, with a low around 67.

Saturday: Mostly sunny, with a high near 89.

Saturday Night: A chance of showers. Partly cloudy, with a low around 64.

Sunday: A chance of showers. Partly sunny, with a high near 84.