Extreme Heat Warning – Sizzling Temperatures And High Humidity This Weekend

UPDATE June 19, 2025, 1:49 PM

The National Weather Service has upgraded the Extreme Heat Watch to an Extreme Heat Warning.

The warning is in effect from noon Friday (June 20) until 9:00 PM Sunday (June 22).

"Dangerously hot conditions with heat index values up to 108 expected. Nighttime heat index values only fall to 75 to 80...Heat related illnesses increase significantly during
extreme heat and high humidity events." - National Weather Service

Read More: Sioux Falls Heat History: When the City Hit Triple Digits

Extreme Heat Warning

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
130 PM CDT Thu Jun 19 2025

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ061-062-065>071-200500-
/O.UPG.KFSD.XH.A.0001.250620T1600Z-250623T0200Z/
/O.NEW.KFSD.XH.W.0001.250620T1700Z-250623T0200Z/
Lyon-Osceola-Dickinson-Sioux-O`Brien-Clay-Plymouth-Cherokee-Buena
Vista-Woodbury-Ida-Lincoln-Lyon-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-McCook-Minnehaha-Hutchinson-Turner-
Lincoln-Bon Homme-Yankton-Clay-Union-
Including the cities of Avon, George, Scotland, Sioux City,
Salem, Beresford, Yankton, Hawarden, Marion, Hurley, Larchwood,
Pipestone, Vermillion, Hartley, Rock Valley, Ivanhoe, Milford,
Battle Creek, Mountain Lake, South Sioux City, Cherokee,
Holstein, Spirit Lake, Lakefield, Sioux Falls, Chancellor,
Sibley, Jackson, Wakefield, Tabor, Canistota, Allen, Sioux
Center, Irene, Harrisburg, Tripp, Jefferson, Storm Lake, Viborg,
Marshall, Windom, Elk Point, Luverne, Lake Benton, Springfield,
Montrose, Arnolds Park, Alcester, Hull, North Sioux City, Le
Mars, Orange City, Sanborn, Freeman, Worthington, Sheldon, Rock
Rapids, Ida Grove, Centerville, Bridgewater, Fulda, Parkston,
Hendricks, Menno, Inwood, Clayton, Tyndall, Ponca, Parker,
Canton, Lennox, Tea, Slayton, Spencer, and Tyler
130 PM CDT Thu Jun 19 2025

...EXTREME HEAT WARNING IN EFFECT FROM NOON FRIDAY TO 9 PM CDT
SUNDAY...

* WHAT...Dangerously hot conditions with heat index values up to 108
  expected. Nighttime heat index values only fall to 75 to 80.

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

* WHEN...From noon Friday to 9 PM CDT Sunday.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat and high humidity events.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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.

ORIGINAL: Published on: Jun 18, 2025 2:23

The National Weather Service has issued an Extreme Heat Watch for southeast South Dakota, including Sioux Falls, as well as northwest Iowa and southwest Minnesota.

The Watch is in effect from Friday morning through Sunday evening (June 20-22, 2025).

The Sioux Empire is forecast to see temperatures near 100 degrees Friday and Saturday. Those temperatures combined with rising humidity will create heat index values near 110 degrees. Plus, it's not going to cool off much at night.

READ MORE: What Are the Signs of Heat Exhaustion and Heat Stroke?

The hot temperatures and high humidity will create a dangerous situation in which heat illnesses are likely. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes.

READ MORE: Man Demonstrates What Happens to Animals and Kids Left in a Hot Car

Get our free mobile app

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
322 AM CDT Thu Jun 19 2025

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ039-040-054>056-060>062-065>071-191800-
/O.EXT.KFSD.XH.A.0001.250620T1600Z-250623T0200Z/
Lyon-Osceola-Dickinson-Sioux-O`Brien-Clay-Plymouth-Cherokee-Buena
Vista-Woodbury-Ida-Lincoln-Lyon-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Kingsbury-Brookings-Miner-Lake-Moody-
Hanson-McCook-Minnehaha-Hutchinson-Turner-Lincoln-Bon Homme-
Yankton-Clay-Union-
Including the cities of Cherokee, Freeman, Hawarden, Beresford,
De Smet, Sibley, Tabor, Lennox, Allen, Inwood, Sioux City,
Brookings, Storm Lake, Bridgewater, Hurley, Luverne, South Sioux
City, Hull, Vermillion, Orange City, Madison, Hartley,
Worthington, Fulda, Marion, Spencer, Lake Preston, Menno, Windom,
Tripp, Marshall, Battle Creek, Ivanhoe, Centerville, Scotland,
Holstein, Larchwood, Emery, Jackson, Avon, Parkston, Canistota,
Canton, Ponca, Rock Rapids, George, Clayton, Springfield,
Milford, Ida Grove, Alcester, Slayton, Mountain Lake, Lake
Benton, Rock Valley, Irene, Viborg, Alexandria, Tyler, Spirit
Lake, Arlington, Sioux Falls, Parker, Salem, Jefferson, Tyndall,
Orland, North Sioux City, Howard, Montrose, Flandreau,
Harrisburg, Pipestone, Le Mars, Hendricks, Yankton, Tea,
Lakefield, Arnolds Park, Sheldon, Sanborn, Sioux Center,
Chancellor, Elk Point, and Wakefield
322 AM CDT Thu Jun 19 2025

...EXTREME HEAT WATCH NOW IN EFFECT FROM FRIDAY MORNING THROUGH
SUNDAY EVENING...

* WHAT...Dangerously hot conditions with heat index values up to 107
  possible.

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

* WHEN...From Friday morning through Sunday evening.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat and high humidity events.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates.

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

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