Data source: National Weather Service (NWS) Last verified: July 17, 2026

Extreme Heat

Heat Advisory (ADVISORY) - expires July 17, 2026 at 3:00 PM EDT

Areas affected: Lyon; Osceola; Dickinson; Sioux; O'Brien; Clay; Plymouth; Cherokee; Buena Vista; Woodbury; Ida; Lincoln; Lyon; Murray; Cottonwood; Nobles; Jackson; Pipestone; Rock; Dixon; Dakota; Beadle; Kingsbury; Brookings; Gregory; Jerauld; Sanborn; Miner; Lake; Moody; Brule; Aurora; Davison; Hanson; McCook; Minnehaha; Charles Mix; Douglas; Hutchinson; Turner; Lincoln; Bon Homme; Yankton; Clay; Union

Heat Advisory issued July 17 at 1:31AM CDT until July 17 at 9:00PM CDT by NWS Sioux Falls SD

• WHAT...Heat index values up to 100 expected.

• WHERE...Portions of northwest and west central Iowa, southwest Minnesota, northeast Nebraska, and central, east central, south central, and southeast South Dakota.

• WHEN...From 1 PM this afternoon to 9 PM CDT this evening.

• IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

What to do: Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

Source: NWS Sioux Falls SD

Heat Advisory (ADVISORY) - expires July 17, 2026 at 12:00 PM EDT

Areas affected: Traverse; Big Stone; Brown; Marshall; Roberts; Walworth; Edmunds; Day; Dewey; Potter; Faulk; Spink; Clark; Codington; Grant; Hamlin; Deuel; Stanley; Sully; Hughes; Hyde; Hand; Jones; Lyman; Buffalo

Heat Advisory issued July 17 at 12:50AM CDT until July 17 at 9:00PM CDT by NWS Aberdeen SD

• WHAT...Heat index values up to 100 expected.

• WHERE...Portions of west central Minnesota and central, north central, and northeast South Dakota.

• WHEN...From 1 PM CDT /noon MDT/ this afternoon to 9 PM CDT /8 PM MDT/ this evening.

• IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

What to do: Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

Source: NWS Aberdeen SD

Heat Advisory (ADVISORY) - expires July 17, 2026 at 7:00 PM EDT

Areas affected: Harding; Northern Perkins; Butte; Northern Meade Co Plains; Ziebach; Northern Foothills; Rapid City; Southern Foothills; Custer Co Plains; Pennington Co Plains; Haakon; Western Fall River; Northern Oglala Lakota; Northern Jackson; Bennett; Mellette; Todd; Tripp; Sturgis/Piedmont Foothills; Southern Meade Co Plains; Hermosa Foothills; Eastern Fall River; Southern Oglala Lakota; Southern Jackson; Southern Perkins; Northern Campbell; Southern Campbell; Western Crook; Weston County Plains; Newcastle; Northeastern Crook

Heat Advisory issued July 17 at 1:49AM MDT until July 19 at 9:00PM MDT by NWS Rapid City SD

• WHAT...Peak afternoon heat index values of 95 to 105.

• WHERE...Portions of northwestern, south central, and southwestern South Dakota and northeast Wyoming.

• WHEN...Until 9 PM MDT /10 PM CDT/ Sunday.

• IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

What to do: Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Source: NWS Rapid City SD

Source

Alert data provided by the National Weather Service (NWS). This page shows active alerts only and is refreshed daily. For real-time updates, visit weather.gov.