Weather forecast for: Marion IL
Last Update: 3:57 pm CDT Sep 18, 2026
This Afternoon: A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 100. Heat index values as high as 105. Southwest wind around 7 mph.
Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 72. Calm wind.
Saturday: Sunny and hot, with a high near 99. Calm wind becoming west southwest 5 to 7 mph in the morning.
Saturday Night: Partly cloudy, with a low around 73. Calm wind becoming southwest around 5 mph after midnight.
Sunday: Sunny and hot, with a high near 98. West wind 3 to 8 mph.
Sunday Night: Partly cloudy, with a low around 70. Calm wind.
Monday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Light north northeast wind becoming north 5 to 9 mph in the morning.
Monday Night: A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 63. North northeast wind 5 to 10 mph.
Tuesday: Partly sunny, with a high near 77. North wind 8 to 11 mph.
Tuesday Night: Partly cloudy, with a low around 58. North wind 5 to 11 mph.
Wednesday: Partly sunny, with a high near 76. North wind 6 to 10 mph.
Wednesday Night: Partly cloudy, with a low around 56. North wind 5 to 7 mph becoming calm in the evening.
Thursday: Mostly sunny, with a high near 77. Calm wind becoming north 5 to 9 mph in the morning.
WeatherWorld.com
City of Marion, IL
