Sioux Falls, South Dakota – Storm prep begins Monday evening across southeast South Dakota as strong thunderstorms bring hail, damaging winds, and heavy rainfall to the region. Winds could gust to 60 mph, with hail up to the size of quarters possible in Sioux Falls and nearby communities by nightfall.
According to the National Weather Service in Sioux Falls, scattered thunderstorms are expected to develop late Monday and continue through Tuesday night. A few storms could become severe, especially along I-29 and in areas west of Sioux Falls including Lake, Moody, and Turner counties. Storm coverage will increase into early Tuesday morning, raising the threat of localized flooding.
While Monday will start sunny with highs near 91°F, conditions shift by night as storms move in from the west. Gusty winds up to 25 mph may precede the main line of storms. Residents are urged to secure outdoor items, charge devices, and avoid unnecessary travel after sunset Monday.
Tuesday night brings the best chance for heavy rain and thunderstorm clusters, particularly between 10 p.m. and 4 a.m. South winds and humid air will fuel instability, increasing storm strength overnight.
Warnings could be issued quickly Monday night, so stay weather-aware and monitor alerts.
🔎 FIVE-DAY FORECAST: MONDAY, JULY 14 – FRIDAY, JULY 18
- Monday: Sunny and hot. High near 91°F. Winds SW 5–10 mph, gusts up to 20 mph.
- Monday Night: Chance of showers and storms after 8 p.m. Low near 70°F. Gusts up to 25 mph possible.
- Tuesday: More storms likely by evening. High near 90°F. Gusty winds and heavy rain possible.
- Wednesday: Showers taper by 1 p.m., then partly sunny. High around 79°F.
- Thursday: Mostly sunny, cooler and drier. High near 76°F.
- Friday: Sunny, warmer. High near 81°F. Slight storm chance returns Friday night.
