Sioux Falls, South Dakota – A dangerous stretch of heat is set to grip South Dakota from noon to 8 p.m. Thursday and Friday, as heat index values soar between 95 and 107 degrees—posing a serious risk, especially in the James and Missouri River valleys. Residents can expect actual afternoon highs to reach the upper 80s and 90s, with stifling humidity pushing the “feels-like” temperature even higher.
According to the National Weather Service in Sioux Falls, this combination of very warm temperatures and high dew points will create a moderate to locally major heat risk to end the work week. Authorities are urging people to stay hydrated, limit outdoor activity to the cooler morning or evening hours, and never leave children or pets in vehicles—even for a short period. Cooling centers may be available, and frequent breaks in air-conditioned spaces are strongly recommended.
Cities including Sioux Falls, Yankton, Brookings, and Mitchell will face the worst of the heat, but smaller communities in the highlighted risk areas aren’t immune. Outdoor workers, older adults, and those without reliable cooling face the greatest threat of heat-related illness. Light clothing, water, and regular check-ins on vulnerable neighbors are key to staying safe.
The extreme heat is expected to break by Saturday, but advisories could extend if the pattern lingers. Stay tuned for updates and take precautions until temperatures ease.
