Temperatures in the 100s expected for southeastern South Dakota this weekend

Makenzie Huber
Sioux Falls Argus Leader

It was 88 degrees at midnight Tuesday in Sioux Falls.

Yes, you read that right.

And if you think that's hot, just wait until you hear about the forecast for the rest of the week:

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How hot is it going to get in Sioux Falls?

The temperature will gradually build this week, rising from the low 80s Tuesday and Wednesday, reaching the 90s on Saturday and peaking near 100 degrees on Sunday. The forecast calls for temperatures to decrease slightly by Monday to a high of 97 degrees.

Cities with expected temperature highs to reach 100 degrees include Sioux City, Chamberlain, Huron, Lake Andes and Mitchell. Yankton will be the hottest on Sunday, topping out at 102 degrees.

Are we in a heat advisory?

While Sioux Falls and South Dakota are not under a heat advisory as of Tuesday, the temperatures are going to become dangerously hot over this week and weekend.

Parts of Minnesota, Iowa and Missouri are under a heat advisory until 7 p.m. Tuesday with heat index values up to around 105 degrees. Indiana, Illinois, and parts of Iowa, Ohio, Kentucky and Missouri are under an extreme heat warning. The heat index values are in effect through 8 p.m. Wednesday in those areas and will be between 105 to 110 at its peak.

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Forecast for the Sioux Falls area from Tuesday through Sunday.

Is severe weather in the forecast for Sioux Falls?

Nighttime storms are expected between Tuesday and Wednesday, according to the NWS. The chance of precipitation in the Sioux Falls area is 60% with rainfall amounts of less than a tenth of an inch expected, except if thunderstorms roll through.

Some of those storms will be severe, but those are expected to occur southeast of Vermillion, Sioux Falls and Marshall with the greatest risk around 3 a.m. Wednesday morning. Potential risks include 2-inch hail and winds of up to 60 mph. Tornadoes are not likely and flash flooding risk is low.

Severe weather is expected to move south of southeastern South Dakota early Wednesday morning.

How to stay safe in the heat

With plenty of outdoor activities and events scheduled for this week and weekend, such as the Sioux Falls Pride parade and festival, know how to protect yourself and your loved ones in this heat.

Heat is one of the leading weather-related killers in the United States, resulting in hundreds of fatalities each year.

To protect yourself during extreme heat and to avoid heat exhaustion and heat stroke, drink plenty of water, seek cool areas or shade, and wear loose and light-colored clothing.

Heat cramps may be the first sign of heat-related illness and may lead to heat exhaustion or stroke.

Signs of heat exhaustion include dizziness, thirst, heavy sweating, nausea and weakness. Signs of heat stroke include confusion, dizziness and falling unconscious. If you or someone experiences a heat stroke, call 911, move to a cooler area, loosen clothing and remove extra layers, and cool with water or ice.

These groups of people are at higher risk of heat-related illness and death:

  • Young children and infants are particularly vulnerable to heat-related illness and death, as their bodies are less able to adapt to heat than are adults. 
  • Older adults, particularly those with pre-existing diseases, take certain medications, are living alone or with limited mobility who are exposed to extreme heat can experience multiple adverse effects.
  • People with chronic medical conditions are more likely to have a serious health problem during a heat wave than healthy people.
  • Pregnant women are also at higher risk. Extreme heat events have been associated with adverse birth outcomes such as low birth weight, preterm birth, and infant mortality, as well as congenital cataracts.

It is never safe to leave a child, disabled person or pet locked in a car. Do not do leave these people or animals in the car alone for any amount of time during times of high heat. Do not take your dog for a walk if the pavement is too hot, either.

Jerryn Moore, 10, plugs his nose as he leaps into an underwater backflip on Wednesday, June 9, 2021 at the Drake Springs Family Aquatic Center in Sioux Falls.

NWS Forecast:

Tuesday: Mostly sunny, with a high near 86. South southwest wind around 15 mph becoming west in the afternoon. Winds could gust as high as 35 mph.

Tuesday night: Showers and thunderstorms likely, mainly after 4am. Increasing clouds, with a low around 61. West wind 5 to 10 mph becoming east after midnight. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday: A chance of showers and thunderstorms, mainly before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 81. East northeast wind 5 to 10 mph becoming west southwest in the afternoon. Chance of precipitation is 50%.

Wednesday Night: Clear, with a low around 58. West southwest wind 5 to 15 mph.

Thursday: Sunny, with a high near 86. West wind 10 to 15 mph, with gusts as high as 30 mph.

Thursday Night: Clear, with a low around 60. West northwest wind 5 to 10 mph becoming north northeast after midnight.

Friday: Sunny, with a high near 88.

Friday Night: Mostly clear, with a low around 68.

Saturday: Sunny, with a high near 94. Breezy.

Saturday Night: Mostly clear, with a low around 75. Breezy.

Sunday: Sunny and hot, with a high near 100.

Sunday Night: Mostly clear, with a low around 76.

Monday: Sunny and hot, with a high near 97.