Get ready, Chicago — the summer heat is making a strong return this weekend. Temperatures will rise into the upper 80s and even touch 90°F, especially by Saturday, bringing back that hot and humid feel across northern Illinois. While the week starts off calm and mostly sunny, the weekend could end with a few isolated thunderstorms.
Dry Through Thursday, Warmer by Friday
According to the National Weather Service in Chicago, the week will be mostly dry, with only a few sprinkles possible on Tuesday night or Wednesday. By Thursday, expect sunshine and warming temperatures in the low to mid-80s, especially away from Lake Michigan.
As the weekend approaches, heat and humidity build. Friday and Saturday will feel like true summer days, with highs climbing to 86–90°F, making it one of the warmest stretches in recent weeks.
Storm Chances Late Saturday Night
The weather could take a turn late Saturday evening into early Sunday, as a weak disturbance may bring scattered showers and a possible thunderstorm. While the risk of severe weather remains low, there could be:
Brief downpours
Occasional lightning
Minor delays to evening outdoor events
Residents and travelers with plans Saturday night should monitor weather updates and have a backup plan just in case.
Heat Safety Tips for the Weekend
With rising humidity and daytime highs nearing 90°F, heat safety is important for everyone, especially athletes, outdoor workers, and event-goers:
Stay hydrated and take regular breaks in the shade
Wear light, breathable clothing
Check in on children and older adults during peak heat
Avoid heavy physical activity in the afternoon
Above-Normal Temperatures Continue Into Next Week
The warmth won’t stop after the weekend. Daytime highs will remain above average into early next week, keeping Chicago in a summerlike pattern even as mid-September arrives.
5-Day Weather Forecast for Chicago, IL
| Day | Conditions | High (°F) | Low (°F) |
|---|---|---|---|
| Wednesday | Partly sunny | 77–81 | 54–63 |
| Thursday | Mostly sunny | 80–85 | 54–63 |
| Friday | Partly cloudy | 84–88 | 60–67 |
| Saturday | Mostly cloudy, humid | 86–90 | 61–67 |
| 20% chance of evening storms | |||
| Sunday | Partly sunny | 84–90 | 61–67 |
