Chicago and northern Illinois are bracing for a taste of summer this week as temperatures are set to climb, bringing highs near 90°F (32°C) by Thursday and Friday. The week will start with relatively mild conditions in the low 80s, but residents can expect a steady increase in heat as the days progress.

Most areas will enjoy predominantly dry conditions, with sunny skies dominating the forecast. However, there is a slight chance of rain south of I-80 on Tuesday afternoon, so residents in these areas should keep an eye on the sky. The rest of the region is expected to remain dry, making it ideal for outdoor activities.

Nights will be muggy, with lows hovering in the 60s, especially near the lakefront. The humidity, combined with the warmer temperatures, may make sleeping uncomfortable for some. Air conditioning or fans are recommended to ensure a comfortable night's rest.

Here’s a day-by-day breakdown: * **Monday:** Sunny with highs in the low 80s. * **Tuesday:** Mostly sunny with a slight chance of rain south of I-80. Highs in the mid-80s. * **Wednesday:** Sunny and warmer, with highs in the upper 80s. * **Thursday:** Mostly sunny with highs near 90°F. * **Friday:** Sunny and hot, with highs near 90°F.

Residents are advised to take precautions to stay cool and hydrated during the hottest parts of the day. Drinking plenty of water, wearing light-colored clothing, and avoiding strenuous activities during peak heat hours can help prevent heat-related illnesses. Those who work outdoors should take frequent breaks in shaded or air-conditioned areas.

Overall, Chicago and northern Illinois are looking forward to a warm and sunny week, perfect for enjoying the outdoors, but residents should be prepared for the rising temperatures and muggy conditions.