A strong ridge of high pressure persisted through the Central and Southern Plains at the start of September and brought hot temperatures to the region with highs in the 90s to around 100 degrees. Dewpoint readings were somewhat lower than late August, mainly in the 60s, which kept the more extreme heat at bay.

Heat in MINER, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 102 degrees was reached at South Dakota Road Weather Information System site SD597 near Howard.

Heat in BRULE, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: AWOS

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 104 degrees was reached at Automated Weather Observing System site K9V9 at Chamberlain and 102 degrees at South Dakota Road Weather Information System site SD537 near Kimball.

Heat in AURORA, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Mesonet

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 106 degrees was briefly reached at South Dakota Road Weather Information System site SD553 near Plankinton and 104 degrees at South Dakota State University Mesonet site WTES2 at White Lake.

Heat in JERAULD, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 104 degrees was reached at South Dakota Road Weather Information System site SD603 near Lane.

Heat in BEADLE, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: ASOS

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 105 degrees was briefly reached at South Dakota Road Weather Information System site SD515 near Cavour and at Automated Surface Observing System site KHON at Huron, and 103 degrees at South Dakota Road Weather Information System site SD582 near Wolsey.

Heat in KINGSBURY, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 101 degrees was reached at South Dakota Road Weather Information System site SD504 near Arlington.

Heat in SANBORN, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Mesonet

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 105 degrees was briefly reached at South Dakota Road Weather Information System site SD527 near Forestburg and 104 degrees at South Dakota State University Mesonet site LCMS2 near Letcher.

Heat in DAVISON, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: ASOS

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 104 degrees was reached at a personal weather station in Ethan and 103 degrees at Automated Surface Observing System site KMHE near Mitchell.

Heat in HUTCHINSON, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Mesonet

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 105 degrees was briefly reached at South Dakota State University Mesonet site PSTS2 at Parkston and 103 degrees at Road Weather Information System site SD570 near Tripp.

Heat in LINCOLN, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: AWOS

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 102 degrees was reached at Automated Weather Observing System sites KY14 at Canton and K7G9 at Tea, as well as at South Dakota Road Weather Information System site SD519 9 miles east of Davis.

Heat in BROOKINGS, SOUTH DAKOTA
From 03-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Mesonet

During the afternoon and early evening of September 3, a maximum heat index of 102 degrees was measured by South Dakota State University Mesonet site OAKS2 near Astoria and 101 degrees by a personal weather station in Elkton.

Heat in GREGORY, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: AWOS

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 104 degrees was reached at South Dakota Road Weather Information System site SD588 near Pickstown and 101 degrees at Automated Weather Observing System site K9D1 at Gregory.

Heat in CHARLES MIX, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: RAWS

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 106 degrees was briefly reached at a personal weather station in Platte, 105 degrees at a RAWS site west of Geddes, and 104 degrees at South Dakota Road Weather Information System site SD554 west of Platte.

Heat in DOUGLAS, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 102 degrees was reached at South Dakota Road Weather Information System site SD601 near Corsica.

Heat in TURNER, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 103 degrees was reached at South Dakota Road Weather Information System site SD615 near Irene.

Heat in BON HOMME, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 102 degrees was reached at South Dakota Road Weather Information System site SD571 near Tyndall.

Heat in YANKTON, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: AWOS

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 102 degrees was reached at Automated Weather Observing System site KYKN at Yankton.

Heat in MCCOOK, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 101 degrees was reached at South Dakota Road Weather Information System sites SD547 near Montrose and SD620 near Dolton.

Heat in LAKE, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: AWOS

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 101 degrees was reached at Automated Weather Observing System site KMDS at Madison.

Heat in CLAY, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Mesonet

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 102 degrees was reached at South Dakota State University Mesonet site BFMS2 7 miles west-southwest of Beresford and Automated Weather Observing System site KVMR near Vermillion.

Heat in UNION, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 104 degrees was reached at South Dakota Road Weather Information System site SD550 in North Sioux City.

Heat in MINNEHAHA, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Mesonet

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 105 degrees was briefly reached at South Dakota State University Mesonet site SFWS2 near Wall Lake, 104 degrees at site BTCS2 near Baltic, and 102 degrees at Automated Surface Observing System site KFSD in Sioux Falls.

Heat in HANSON, SOUTH DAKOTA
From 02-SEP-23 12:00:00 to 03-SEP-23 18:00:00 (CST-6)
Reported by: Department of Highways

Over a two-day period from the afternoon of September 2 through early evening on September 3, a maximum heat index of 106 degrees was briefly reached at South Dakota Road Weather Information System site SD502 near Alexandria.