Pierre, South Dakota – Sweltering heat is gripping much of central and eastern South Dakota this afternoon, with heat index values soaring past 100 degrees and prompting health warnings from state and local agencies.
According to the National Weather Service in Aberdeen, a heat advisory remains in effect for 20 counties—including Pierre, Watertown, Milbank, Gettysburg, and Redfield—until 8 p.m. CDT Tuesday. The most severe conditions are expected along the Missouri River corridor, where Pierre and surrounding towns could see heat indices as high as 103.
Cities from Ortonville, Minnesota, to Fort Thompson, South Dakota, are being urged to avoid strenuous outdoor activity and check on vulnerable neighbors. Hydration, seeking air-conditioned shelter, and wearing lightweight clothing are all strongly advised. Highway crews, farm workers, and anyone laboring outdoors should take frequent breaks in the shade, as recommended by the Occupational Safety and Health Administration. Emergency officials warn that symptoms of heat exhaustion—such as heavy sweating, dizziness, or nausea—require immediate action, including moving to a cooler location. Heat stroke is a medical emergency; call 911 if suspected.
This heat advisory follows a pattern of persistent summer warmth in the region, with similar heat events in July 2021. Power companies urge residents to limit energy use during peak afternoon hours to prevent outages.
The advisory is set to expire at 8 p.m., but additional alerts may be issued if conditions persist. Stay tuned for the latest updates.
