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City of Markham, ILMarkham, IL 7-Day Night Weather Forecast
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Markham, IL Weather Forecast
Markham, IL Weather Forecast Date: 256 AM CDT Fri Sep 04 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.
Early This Morning... Mostly clear. Temperatures in the upper 70s. Southwest winds around 5 mph.
Today... Mostly sunny. A slight chance of showers and thunderstorms late in the morning. Hot, humid. Highs in the mid 90s. West winds around 5 mph, increasing to around 10 mph in the afternoon. Chance of precipitation 20%. Heat index values up to 106.
Tonight... Partly cloudy. A slight chance of showers and thunderstorms late in the evening. A chance of showers and thunderstorms after midnight, then a slight chance of showers and thunderstorms late. Humid with lows in the lower 70s. West winds around 5 mph. Chance of precipitation 30%. Heat index values up to 100 early in the evening.
Saturday... Partly cloudy. Humid with highs in the upper 80s. North winds 5 to 10 mph.
Saturday Night... Partly cloudy. Humid with lows in the upper 60s. Northeast winds 5 to 10 mph.
Sunday... Mostly sunny in the morning, then becoming partly cloudy. Highs in the lower 80s. East winds around 5 mph, increasing to northeast in the afternoon.
Sunday Night... Partly cloudy. Lows in the mid 60s.
Labor Day... Partly cloudy. Highs in the lower 80s.
Monday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 60s.
Tuesday... Mostly cloudy. Highs in the mid 80s.
Tuesday Night... Partly cloudy. Lows in the lower 70s.
Wednesday... Partly cloudy. Highs around 90.
Wednesday Night... Partly cloudy. A chance of showers after midnight. Lows in the lower 70s. Chance of precipitation 40%.
POP = Probability of Precipitation
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