Chicago, Illinois – A July heat surge will grip Illinois starting Sunday, with sunny skies pushing Chicago temperatures toward 90°F by Monday afternoon. That early-week warmth could give way to showers and thunderstorms by late Tuesday, raising the risk of slowdowns along I-55 and I-294.
According to the National Weather Service, Sunday, July 13, begins mostly sunny with a high near 84°F and light west winds. By Monday, expect full sun and highs climbing to 90°F—potentially the warmest day of the month so far. A brief window of dry, calm weather gives way Tuesday afternoon when a chance of showers develops after 1 p.m., intensifying into storms by Wednesday.
Cities across Cook, DuPage, and Lake Counties should monitor local alerts for pop-up storms, especially during Tuesday evening commutes. Rainfall could affect public transit schedules and localized road flooding on low-lying roads near Lake Shore Drive and underpasses along I-94.
Chicagoans can expect a weather pattern shift by midweek, with storm chances Wednesday and Thursday before cooler, drier air returns Friday.
🌤 Five-Day Forecast for Chicago (July 13–17):
- Sunday: Mostly sunny, high near 84°F
- Monday: Sunny and hot, high near 90°F
- Tuesday: Mostly sunny early; chance of showers after 1 p.m., high near 86°F
- Wednesday: Showers and possible thunderstorms after 1 p.m., high near 82°F
- Thursday: Partly sunny with scattered thunderstorms, high near 83°F
