Weather forecast for: Harrisburg IL
Last Update: 9:01 pm CDT Sep 18, 2026
Tonight: Partly cloudy, with a low around 71. East southeast wind around 5 mph becoming calm in the evening.
Saturday: Sunny and hot, with a high near 99. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Saturday Night: Partly cloudy, with a low around 73. Light south southwest wind.
Sunday: Sunny and hot, with a high near 98. West wind 3 to 7 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. Calm wind becoming north 5 to 8 mph in the morning.
Monday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62. North northeast wind 5 to 9 mph.
Tuesday: A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 77. North wind 7 to 10 mph.
Tuesday Night: Partly cloudy, with a low around 57. North wind 5 to 11 mph, with gusts as high as 18 mph.
Wednesday: Mostly sunny, with a high near 77. North wind 5 to 9 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 78. Calm wind becoming north 5 to 8 mph in the morning.
Thursday Night: Partly cloudy, with a low around 58. North northeast wind around 6 mph becoming calm in the evening.
Friday: Mostly sunny, with a high near 77. Calm wind becoming north northeast 5 to 9 mph in the morning.
WeatherWorld.com
City of Harrisburg, IL
