Weather forecast for: Harrisburg IL
Last Update: 7:06 am CDT Sep 18, 2026
Today: A 10 percent chance of showers after 5pm. Sunny and hot, with a high near 98. Calm wind.
Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 71. Calm wind.
Saturday: Sunny and hot, with a high near 97. Calm wind becoming west southwest around 6 mph in the afternoon.
Saturday Night: Partly cloudy, with a low around 72. Light south wind.
Sunday: Mostly sunny and hot, with a high near 97. West wind 3 to 7 mph.
Sunday Night: Partly cloudy, with a low around 70. Calm wind.
Monday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Calm wind becoming north northwest 5 to 8 mph in the afternoon.
Monday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 63. North wind 3 to 8 mph.
Tuesday: A slight chance of showers before 1pm. Partly sunny, with a high near 78. North wind 6 to 10 mph.
Tuesday Night: Partly cloudy, with a low around 57. North wind 5 to 11 mph, with gusts as high as 20 mph.
Wednesday: Mostly sunny, with a high near 76. North wind 5 to 9 mph.
Wednesday Night: Partly cloudy, with a low around 55. North wind around 6 mph becoming calm in the evening.
Thursday: Mostly sunny, with a high near 78. Calm wind becoming north 5 to 9 mph in the morning.
WeatherWorld.com
City of Harrisburg, IL
