Excessive Heat in Bon Homme, South Dakota

Excessive Heat July 21, 2025 – July 22, 2025 · Bon Homme, South Dakota

What the National Weather Service wrote

Dangerous heat index readings reached daily afternoon peaks as high as 109 degrees 6 miles south of Scotland on July 22.

The wider storm

Moisture 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. Most areas experienced heat index values from 100 to 115 degrees, with the most consistent and highest heat index values on the afternoon of July 23 across far southeast South Dakota, northwest Iowa, and northeast Nebraska.

Source: NOAA Storm Events Database, event 1288565. Narratives are written by the National Weather Service forecast office that issued the report.

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