Weather forecast for: Marion IL
Last Update: 4:25 am CDT Sep 16, 2026
Today: Sunny and hot, with a high near 100. Heat index values as high as 107. South southwest wind around 8 mph.
Tonight: Mostly clear, with a low around 74. Light south wind.
Thursday: Sunny and hot, with a high near 99. Heat index values as high as 106. South southwest wind 5 to 8 mph becoming west northwest in the afternoon.
Thursday Night: Partly cloudy, with a low around 73. Calm wind.
Friday: Mostly sunny and hot, with a high near 98. Light east wind.
Friday Night: Mostly clear, with a low around 72. Calm wind.
Saturday: Mostly sunny and hot, with a high near 100. Calm wind becoming west southwest 5 to 9 mph in the morning.
Saturday Night: Partly cloudy, with a low around 72. South southwest wind 3 to 5 mph.
Sunday: Mostly sunny, with a high near 96. West wind 3 to 8 mph.
Sunday Night: Partly cloudy, with a low around 70. Light and variable wind.
Monday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. West wind 3 to 8 mph.
Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 65. North wind around 6 mph becoming calm in the evening.
Tuesday: A chance of showers. Partly sunny, with a high near 86. North northeast wind 3 to 7 mph.
WeatherWorld.com
City of Marion, IL
