Excessive Heat — Montgomery, Iowa

2025-06-20 to 2025-06-22 · Montgomery, Iowa

Event narrative

KRDK AWOS measured heat index up to 108 degrees with a minimum heat index of 78 degrees through the period. Personal weather station measured heat index of 111, 112 and 113 degrees.

Wider weather episode

A prolonged stretch of dangerous heat impacted eastern Nebraska and southwest Iowa from Friday, June 20th through Sunday, June 22nd, 2025. The heat was driven by a mid-level ridge centered over the central Plains, resulting in oppressive conditions across the region. Heat index values peaked between 109 and 115 degrees, based on observations from ASOS/AWOS sites and personal weather stations. Overnight lows remained uncomfortably warm, ranging from the mid-70s to around 80 degrees, with minimum heat indices lingering in the upper 70s to mid 80s. This lack of overnight relief contributed to accumulating heat stress, particularly among vulnerable populations.

Source: NOAA Storm Events Database, event_id 1268762. Narrative written by the NWS forecast office that issued the report.