Excessive Heat in Osceola, Iowa

Excessive Heat August 16, 2025 – August 17, 2025 · Osceola, Iowa

What the National Weather Service wrote

Dangerous heat index values peaked as high as 110 degrees 6 miles northeast of Hartley and 106 degrees at Ashton on August 16.

The wider storm

Heat and moisture pooled near and south of a nearly stationary frontal boundary across eastern South Dakota and southern Minnesota. Daily highs were in the mid 80s to lower 90s with dew point values in the upper 70s to lower 80s, yielding heat index values from 100 to 115 degrees.

Source: NOAA Storm Events Database, event 1291159. Narratives are written by the National Weather Service forecast office that issued the report.

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