BALTIMORE, MD (Friday, June 20, 2025) – With temperatures expected to rise in the Baltimore region and the heat index forecasted to reach over 100 degrees Fahrenheit for multiple days starting Sunday, June 22nd, the Baltimore City Interim Commissioner of Health Mary Beth Haller has declared a Code Red Extreme Heat Alert for Sunday, 22nd through Thursday, June 26th. The heat index is a measure of air temperature and relative humidity and indicates how hot it feels to the human body.