Excessive Heat in Sioux, Iowa

Excessive Heat August 15, 2025 – August 16, 2025 · Sioux, Iowa

What the National Weather Service wrote

Dangerous heat index values peaked as high as 112 degrees at Hawarden and 106 degrees at Orange City 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 1291161. Narratives are written by the National Weather Service forecast office that issued the report.

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