| NWS Forecast for: Markham IL Issued by: National Weather Service Chicago, IL Last Update: 2:46 am CDT Jul 15, 2026 |  |
Overnight: Patchy fog. Otherwise, clear, with a low around 75. West wind around 5 mph. Wednesday: Patchy fog before 8am. Otherwise, sunny and hot, with a high near 95. Heat index values as high as 103. Calm wind becoming west around 5 mph in the afternoon. Wednesday Night: Partly cloudy, with a low around 74. Northeast wind around 5 mph becoming calm in the evening. Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Patchy smoke before noon. Mostly sunny and hot, with a high near 95. Heat index values as high as 99. Calm wind becoming east northeast around 5 mph in the afternoon. Thursday Night: A slight chance of showers and thunderstorms. Patchy smoke before 8pm. Partly cloudy, with a low around 74. East northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%. Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 90. Chance of precipitation is 70%. Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. Saturday: A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Saturday Night: Partly cloudy, with a low around 70. Sunday: Mostly sunny, with a high near 86. Sunday Night: Partly cloudy, with a low around 69. Monday: A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 70. Tuesday: Mostly sunny, with a high near 83. | |
| Markham IL 41.6°N 87.7°W | |
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