Sioux Falls, South Dakota – Storms may clear by Friday, but a fast-building heat wave could bake Sioux Falls by Saturday with highs pushing 94°F.
According to the National Weather Service, thunderstorms will likely continue through Thursday night, but drier air arrives Friday, bringing clearing skies and warmer temps. Friday will see highs near 84°F under partly sunny skies, with winds turning from calm to light southeast in the afternoon.
Saturday brings the real summer punch. Sioux Falls and surrounding areas will climb into the mid-90s with just a 20% chance of afternoon showers. The South Dakota Department of Health urges residents to hydrate, limit midday outdoor activity, and check cooling centers if needed.
Drivers on I-29, I-229, and US-18 should prepare for heat shimmer and possible roadwork delays during peak hours, especially Saturday afternoon. While Saturday night could see isolated storms, the bigger concern is heat stress and poor air circulation.
Sunday will offer partial relief, with a high of 89°F and a 30% chance of afternoon storms. Conditions turn drier and seasonally warm into early next week, with sunny skies and highs holding near the upper 80s through Wednesday.
Five-Day Sioux Falls Forecast (June 26–July 1)
- Thursday: High 76°F – Showers likely, thunderstorms before 1 p.m.
- Friday: High 84°F – Mostly sunny, dry and warmer
- Saturday: High 94°F – Sunny and hot, slight chance of p.m. storms
- Sunday: High 89°F – Partly sunny, 30% chance of p.m. showers
- Monday: High 87°F – Mostly sunny, dry and mild
