Weather forecast for: Flat Rock IL
Last Update: 7:36 am CDT Sep 3, 2026
Today: Sunny and hot, with a high near 99. Heat index values as high as 105. West southwest wind 5 to 8 mph.
Tonight: Mostly clear, with a low around 75. Light south wind.
Friday: Sunny and hot, with a high near 100. Heat index values as high as 105. Calm wind becoming west 5 to 7 mph in the morning.
Friday Night: Mostly clear, with a low around 75. Light and variable wind.
Saturday: Sunny and hot, with a high near 96. Calm wind becoming northwest around 6 mph in the afternoon.
Saturday Night: Mostly clear, with a low around 70. Northeast wind around 6 mph.
Sunday: Mostly sunny, with a high near 91. Northeast wind 7 to 10 mph, with gusts as high as 15 mph.
Sunday Night: Mostly clear, with a low around 63.
Labor Day: Sunny, with a high near 91.
Monday Night: Mostly clear, with a low around 67.
Tuesday: Sunny and hot, with a high near 95.
Tuesday Night: Mostly clear, with a low around 73.
Wednesday: Sunny and hot, with a high near 97.
WeatherWorld.com
