Weather forecast for: Chester IL
Last Update: 9:26 pm CDT Sep 18, 2026
Tonight: Partly cloudy, with a low around 70. Light south wind.
Saturday: Increasing clouds and hot, with a high near 98. Heat index values as high as 101. Light and variable wind becoming west around 6 mph in the morning.
Saturday Night: Partly cloudy, with a low around 71. Southwest wind 3 to 5 mph.
Sunday: Mostly sunny, with a high near 95. Calm wind becoming west around 6 mph in the morning.
Sunday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. Light north wind.
Monday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 85. Chance of precipitation is 50%.
Monday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 60. Chance of precipitation is 30%.
Tuesday: Partly sunny, with a high near 75.
Tuesday Night: Partly cloudy, with a low around 55.
Wednesday: Mostly sunny, with a high near 76.
Wednesday Night: Partly cloudy, with a low around 54.
Thursday: Mostly sunny, with a high near 76.
Thursday Night: Partly cloudy, with a low around 56.
Friday: Mostly sunny, with a high near 77.
WeatherWorld.com
