Heat in Bon Homme, South Dakota

Heat June 29, 2026 · Bon Homme, South Dakota

What the National Weather Service wrote

Dangerous heat index readings reached a brief afternoon peak as high as 104 degrees

near Tyndall.

The wider storm

A large high pressure system parked over the Mississippi River Valley, bringing several days of hot, southerly flow across the region. From the afternoon of June 28 to the evening of June 29, the combination of heat and humidity, boosted by recent rain, created dangerous conditions. Some heat index values exceeded 105 to 110 degrees in and near northwest Iowa.

Source: NOAA Storm Events Database, event 1351661. Narratives are written by the National Weather Service forecast office that issued the report.

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