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Illinois School, IL Weather Forecast
Illinois School, IL Weather Forecast Date: 321 PM CDT Sat Sep 12 2026
The area/counties/county of: Southern Cook, including the cities of: Calumet City, Oak Forest, Lemont, Orland Park, and Park Forest.or toggle through each period.
Late This Afternoon... Partly cloudy. Temperatures in the upper 80s. West winds around 10 mph.
Tonight... Partly cloudy. A chance of sprinkles early in the evening. Lows in the mid 60s. Northwest winds 5 to 10 mph, becoming north after midnight.
Sunday... Partly cloudy in the morning, then becoming mostly cloudy. A chance of showers in the afternoon. Less humid with highs in the upper 70s. North winds around 5 mph, increasing to around 10 mph in the afternoon. Chance of precipitation 40%.
Sunday Night... Partly cloudy in the evening, then clearing. Lows in the lower 50s. North winds 5 to 10 mph.
Monday... Mostly sunny in the morning, then becoming partly cloudy. Highs in the mid 70s. Southeast winds 5 to 10 mph.
Monday Night... Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 60s. Southeast winds 10 to 15 mph, increasing to south 15 to 20 mph after midnight. Chance of precipitation 20%.
Tuesday... Mostly cloudy with a chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of precipitation 50%.
Tuesday Night... Showers with a chance of thunderstorms. Lows in the upper 60s. Chance of precipitation 80%.
Wednesday... Showers likely, mainly in the morning. Highs in the upper 70s. Chance of precipitation 70%.
Wednesday Night... Mostly cloudy. A chance of showers in the evening, then showers likely after midnight. Lows in the upper 60s. Chance of precipitation 60%.
Thursday... Showers likely in the morning. Highs around 80. Chance of precipitation 60%.
Thursday Night... Mostly cloudy. A chance of showers after midnight. Lows in the lower 60s. Chance of precipitation 30%.
Friday... Mostly cloudy. A chance of showers in the morning. Highs in the mid 70s. Chance of precipitation 40%.
Friday Night... Mostly cloudy in the evening, then becoming partly cloudy. A 40% chance of showers. Lows in the lower 60s.
POP = Probability of Precipitation
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