As summer heat returns, temperatures are expected to rise into the 90s this week across various regions, including Central Maryland and Michigan. Baltimore is anticipating a mix of warm and muggy weather, with chances of afternoon thundershowers, particularly inland, while heat indices could feel like the mid to upper 90s in some areas. In Michigan, highs are projected to reach the low 90s, with a sticky humidity making it uncomfortable for outdoor activities. The week will also see a backdoor cool front bringing brief relief with some cooler winds by Friday and Saturday. Schools are reopening in parts of Maryland amid this heat, raising concerns for sensitive groups. Overall, the heat wave is expected to persist into the Labor Day weekend, prompting health advisories for outdoor activities.