| NWS Forecast for: Chicago/Romeoville, Lewis University Airport IL Issued by: National Weather Service Chicago, IL Last Update: 4:15 am CDT Aug 18, 2026 |  |
| Today: A slight chance of showers between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 26. West southwest wind 10 to 15 km/h increasing to 15 to 20 km/h in the afternoon. Winds could gust as high as 35 km/h. Chance of precipitation is 30%. Tonight: A chance of showers and thunderstorms before 4am, then a slight chance of showers. Mostly cloudy, with a low around 18. West southwest wind 10 to 15 km/h, with gusts as high as 25 km/h. Chance of precipitation is 50%. Wednesday: Partly sunny, with a high near 26. North northwest wind 5 to 10 km/h. Wednesday Night: Partly cloudy, with a low around 16. East wind 5 to 10 km/h becoming calm in the evening. Thursday: Sunny, with a high near 26. Calm wind becoming north 5 to 10 km/h in the afternoon. Thursday Night: Mostly clear, with a low around 16. Friday: Mostly sunny, with a high near 25. Friday Night: A chance of showers. Partly cloudy, with a low around 18. Saturday: A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 26. Saturday Night: Partly cloudy, with a low around 16. Sunday: Mostly sunny, with a high near 24. Sunday Night: Partly cloudy, with a low around 16. Monday: Mostly sunny, with a high near 24. | |
| Chicago/Romeoville, Lewis University Airport IL 41.61°N 88.1°W | |
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