Sioux Falls, South Dakota – Temperatures across South Dakota are soaring into the upper 90s with heat index values peaking between 100° and 110° through Tuesday, posing a serious risk for heat-related illness—especially for those without air conditioning or working outdoors.
According to the National Weather Service in Sioux Falls, Tuesday’s heat wave will push actual highs to 94°, but the humidity will make it feel even hotter. The most oppressive conditions will blanket eastern and central South Dakota, with Redfield, Winner, and Sioux Falls all expecting triple-digit “feels like” readings. Overnight brings a renewed chance of isolated storms, particularly north of Interstate 90 and into northern counties including Watertown and Brookings.
Widespread rain and the highest risk for severe storms arrive late Wednesday into Thursday, potentially bringing strong winds and heavy downpours across the state. Residents from Aberdeen to Yankton should be alert for rapidly changing weather, power outages, and possible travel delays on key routes such as I-29 and I-90.
Health officials urge South Dakotans to drink plenty of water, avoid strenuous activity during peak afternoon hours, and check on vulnerable neighbors. Wear light clothing and never leave children or pets unattended in vehicles.
Drier, calmer weather is expected by Friday as temperatures ease back to near-normal July values. Stay tuned for new weather advisories as the week’s storm pattern evolves.
