Chicago, Illinois – Summer heat is set to make a comeback across northern Illinois, with highs climbing into the upper 80s and even near 90 degrees in Chicago by the weekend. Residents should also prepare for a slight thunderstorm chance Saturday night that could disrupt outdoor plans.
According to the National Weather Service in Chicago, most of the area will stay dry this week, with only a few sprinkles possible tonight and Wednesday. Sunshine dominates through Thursday, with highs in the lower to mid-80s away from the lake. Conditions grow warmer Friday into Saturday, when temperatures are expected to reach the upper 80s, and humidity will also increase.
The best chance for unsettled weather arrives late Saturday into early Sunday, when a weak disturbance could bring scattered showers and a possible thunderstorm. While widespread severe weather isn’t expected, brief downpours and lightning may cause delays for evening events.
Travelers should monitor conditions closely, especially those with Saturday evening plans. Outdoor workers and athletes are advised to stay hydrated as heat builds through the weekend.
Warm weather holds through early next week, with daytime highs staying well above normal for mid-September. Additional weather advisories could follow if storm chances increase.
Five Day Forecast for Chicago, Illinois
- Wednesday: Partly sunny, high 77–81, low 54–63
- Thursday: Mostly sunny, high 80–85, low 54–63
- Friday: Partly cloudy, high 84–88, low 60–67
- Saturday: Mostly cloudy, high 86–90, low 61–67, 20% chance of evening storms
- Sunday: Partly sunny, high 84–90, low 61–67
