Excessive Heat in South Dakota

Events

618

Deaths

1

Injuries

10

Damage

$54,000

• Excessive Heat in South Dakota, August 21 to 24, 20231 death · 24 eventsAn immense ridge of high pressure over the Central Plains and Mississippi Valley entrenched heat and high dewpoint air across the region, resulting in daily heat indices from 100 to around 120, with very little recovery during the overnight hours.
• Excessive Heat in South Dakota, July 18 to 24, 201210 injured · 22 eventsA combination of high heat and humidity persisted for several days. Daytime temperatures reached the 90s to several degrees above 100, and dew points were in the 70s. The heat index went as high as 110 degrees.
• Excessive Heat in South Dakota, July 15 to 20, 2011$30,000 · 24 eventsSeveral consecutive days were experienced with an extremely stressful combination of high heat and humidity. Heat indices frequently rose above 115 degrees during the day, with temperatures reaching the 90s and dew points remaining in the 70s to lower 80s.
• Excessive Heat in South Dakota, July 25 to 27, 2024$24,000 · 16 eventsThe region witnessed three days of high heat and humidity in late July. Peak temperatures for the three day period included a high of 105 degrees measured at the South Dakota extension mesonet station 7 miles southwest of Hayes, 104 degrees at Pierre municipal airport and 103…
• Excessive Heat in South Dakota, July 15 to 20, 201126 eventsA large upper level high pressure area built over the region bringing very hot and humid conditions. This was the worst heat wave to hit the region since July 2006.
• Excessive Heat in South Dakota, July 19 to 22, 201626 eventsA very warm and abnormally large upper level high pressure area along with high dew points brought high heat indices to central and northeast South Dakota. High temperatures were in the upper 80s to the 100s with overnight lows in the upper 60s to the mid 70s.
• Excessive Heat in South Dakota, August 21 to 23, 202325 eventsA heat dome to the south resulted in temperatures topping out in the 90s to just over 100 degrees, with dewpoints in the 70s to low 80s, generating heat index values in excess of 100 degrees for a three day period.
• Excessive Heat in South Dakota, July 2 to 6, 201224 eventsA combination of high heat and humidity persisted for several days. Daytime temperatures reached the 90s to several degrees above 100, and dew points were in the 70s. The heat index went as high as 110 degrees.
• Excessive Heat in South Dakota, July 15 to 16, 201224 eventsA combination of high heat and humidity consisted of daytime temperatures reaching the 90s to several degrees above 100, and dew points in the 70s. The heat index went as high as 108 degrees.
• Excessive Heat in South Dakota, June 10 to 12, 201624 eventsRapidly developing very hot and humid weather, with daytime temperatures reaching the 95 to 100 degree range, brought the heat index to above 100 during the afternoon hours of June 10th through June 12th.
• Excessive Heat in South Dakota, July 19 to 23, 201624 eventsVery hot and very humid weather, with daytime temperatures reaching the 95 to 100 degree range, brought the heat index to 100 to 115 degrees during the afternoon hours of July 19th through July 23rd.
• Excessive Heat and Heat in South Dakota, June 29, 201924 eventsOppressive temperatures in the mid 90's to around 100 degrees along with dew point readings in the mid to upper 70's produced very dangerous heat conditions with heat index readings in excess of 105 degrees for much of the afternoon and early evening.|Numerous roads across the…
• Excessive Heat in South Dakota, July 25 to 28, 202324 eventsStrong high pressure and elevated near surface moisture resulted in a multi-day heat wave across southeast South Dakota, southwest Minnesota, northwest Iowa, and northeast Nebraska from July 25-28.
• Excessive Heat and Heat in South Dakota, August 25 to 26, 202424 eventsA strong ridge of high pressure locked in very warm and extremely humid conditions. Dew points in the upper 70s and lower 80s combined with temperatures in the upper 80s to lower 90s to produce daily heat index values from 100 to 120 degrees.
• Excessive Heat in South Dakota, June 20 to 22, 202524 eventsThe upper-level pattern experienced amplification of an eastern U.S. ridge and western U.S. trough, which locked a low-level frontal boundary in place from western Nebraska through central South Dakota into the Great Lakes.
• Excessive Heat in South Dakota, July 27 to 28, 202524 eventsBeneath an expansive and strong, flat ridge aloft, extreme surface-based moisture returned near a diffuse warm frontal boundary on July 26 and lasted into the afternoon of July 28.
• Excessive Heat and Heat in South Dakota, July 13 to 15, 202423 eventsVery warm temperatures with highs in the lower to mid 90s paired with oppressive dew point readings in the upper 70s to lower 80s produced afternoon and evening heat indices generally from 100 to 120 degrees with little overnight recovery.
• Excessive Heat and Heat in South Dakota, July 31, 202422 eventsPooling moisture ahead of a frontal boundary pushed dew point readings into the upper 70s and lower 80s, and temperatures in the upper 80s to lower 90s produced heat index values from 100 to 115 degrees.
• Excessive Heat and Heat in South Dakota, August 19, 202321 eventsAn expanding upper-level ridge across the southern and central U.S. pushed heat into the region, as moisture pooled just ahead of an advancing frontal zone. The combination of heat and higher dewpoints resulted in afternoon and early evening heat indices from 100 to 115 degrees.
• Excessive Heat and Heat in South Dakota, August 2 to 3, 202421 eventsStagnant conditions south of a stalled frontal boundary across North Dakota and central Minnesota led to high dew points and very warm conditions across the region. Afternoon and early evening heat index values varied from 100 to 110 degrees each afternoon.
• Excessive Heat in South Dakota, August 1, 201219 eventsTemperatures reaching the 90s and high humidity with dew points in the 70s caused excessive heat during the afternoon of August 1st in southeast South Dakota near and south of Interstate 90.
• Excessive Heat and Heat in South Dakota, June 29, 202619 eventsA large high pressure system parked over the Mississippi River Valley, bringing several days of hot, southerly flow across the region.
• Excessive Heat in South Dakota, June 26 to 27, 201218 eventsA combination of high heat and humidity, with temperatures reaching the 90s and dew points in the 70s, pushed the heat index to a little above 100 degrees during the afternoon and early evening hours.
• Excessive Heat in South Dakota, July 18, 202218 eventsHot temperatures in the 90s and lower 100s, along with dew point temperatures in the 60s and lower 70s, produced heat indices of 100 to near 110 degrees during the afternoon of July 18th. Some activities were postponed or canceled due to the heat.
• Excessive Heat and Heat in South Dakota, July 21 to 23, 202518 eventsMoisture pooled in the vicinity of a nearly stationary boundary early on July 21, which slowly worked northward as a warm front over the next two days while a large upper level ridge expanded across the Northern Plains.

Excessive Heat everywhereEvery kind of event in South Dakota

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.