Sioux Falls, South Dakota – Triple-digit heat and severe storm potential are converging on South Dakota this Monday, July 28, as a summer weather alert intensifies across the region.
According to the National Weather Service in Sioux Falls, Monday’s high will reach near 95°F, with heat index values soaring to 107°F by afternoon. Residents across Minnehaha County and surrounding areas should avoid outdoor activity during peak heat and hydrate frequently. Winds from the east at 5 to 10 mph will offer little relief.
Storms are likely to develop late Monday night, particularly across southwestern Minnesota, with the threat extending into southeast South Dakota and northwest Iowa. Large hail — possibly up to ping-pong ball size — and damaging wind gusts over 60 mph could hit areas east of I-29. Locally heavy rainfall may also lead to brief street flooding, especially in urban pockets of Sioux Falls.
Heat and humidity will linger through Tuesday, with highs near 84°F and a 40% chance of storms continuing into Tuesday night. Winds will shift northeast at 10 mph with higher gusts during any thunderstorms.
5-Day Outlook (July 28–Aug. 2)
- Monday: Hot, high near 95°F. Storm chance late.
- Tuesday: Scattered thunderstorms, high near 84°F.
- Wednesday: Partly sunny, high near 78°F.
- Thursday: Mostly sunny, high near 77°F.
- Friday/Saturday: Cooler trend continues, highs in the mid-70s.
Plan for rapidly changing conditions through midweek. Storm warnings may be issued with short notice. Avoid non-essential travel during storms and secure outdoor items.
⚠️ Next Update: Watch for potential severe weather alerts by late Monday as storms approach the Sioux Falls metro.
