Chicago, IL – Get ready for a surge of summer-like heat this weekend as Chicago and northern Illinois experience a hot and humid stretch, with temperatures soaring into the upper 80s and near 90 degrees. While most of the week promises dry and sunny conditions, a chance of isolated thunderstorms late Saturday could impact outdoor plans for residents and visitors alike.
The National Weather Service in Chicago forecasts that while the early part of the week remains mostly dry with a few brief sprinkles possible, sunny skies will dominate until Thursday. Temperatures are expected to increase steadily, peaking over the weekend alongside rising humidity levels, making it feel much warmer than typical for mid-September.
A Gradual Warm-Up and Humidity Rise Through the Week
The weather outlook for Chicago shows a gradual climb in temperature and humidity, signaling a brief return to summer-like conditions. Highlights include:
- Wednesday: Partly sunny, highs between 77 and 81°F, lows comfortable between 54 and 63°F.
- Thursday: Mostly sunny with temperatures rising to the mid-80s, lows steady in the mid-50s to low 60s.
- Friday: Partly cloudy skies with highs climbing to 84–88°F and lows between 60 and 67°F.
This warm-up pace sets the stage for a notably hotter weekend compared to typical mid-September trends.
Isolated Thunderstorms Possible Late Saturday
Chicagoans should be aware of a 20% chance of evening thunderstorms Saturday, as a weak atmospheric disturbance moves through the area. According to meteorologists, while widespread severe weather is unlikely, residents need to stay alert for:
- Brief downpours that may cause localized flooding or slippery surfaces.
- Lightning that could disrupt outdoor evening events or travel plans.
“Although most of the week remains dry, we recommend monitoring conditions closely on Saturday evening, especially if you have outdoor plans,” advised the National Weather Service in Chicago.
Travelers and outdoor workers should take extra precautions to stay hydrated as humidity and temperatures rise, increasing the risk of heat-related stresses.
Extended Warmth Expected into Early Next Week
Following the weekend, the warm weather pattern is forecasted to persist through early next week, with highs continuing well above the seasonal average. Sunday will see partly sunny skies with highs between 84 and 90°F and lows again between 61 and 67°F. The weather service also cautions that further updates and advisories may be issued if storm chances increase going forward.
Five Day Forecast Summary 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
What do you think about this weekend’s forecast? Are you planning any outdoor activities in Chicago despite the chance of storms? Share your thoughts and plans in the comments below!
