Dangerous Heat Wave Continues Across Portions of US and Puerto Rico with Extreme Heat Warnings and Advisories

A prolonged and dangerous heat wave is affecting multiple regions. The National Weather Service (NWS) in Lincoln, IL, predicts heat indices up to 105°F through Friday, September 5, 2026, for parts of Illinois, Indiana, and Ohio. An Extreme Heat Warning is in effect for southern Illinois, southwestern Indiana, western Kentucky, and southeastern Missouri through 8 PM CDT on September 5, with daily peak heat-index values of 103-109°F. Central Indiana also continues under a Heat Advisory through Friday evening, with heat indices reaching 100-110°F. In South Texas, heat indices could exceed 110°F this weekend and early next week. Additionally, the NWS San Juan warns that heat will be the primary concern for Puerto Rico this holiday weekend (September 5-7, 2026), urging residents to stay hydrated and take frequent breaks.