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2026 Meteorological Summer Climate Summary
August 2026 Upper Mississippi River Valley Weather Summary

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Increasing Rain Chances Overnight

A mostly dry Labor Day expected with daytime high temperatures a few degrees above and below 80°. Increasing rain chances overnight from west to east decrease temporarily Tuesday through late morning into the early afternoon before returning Tuesday evening and night. Heavy rain will be the main impact as a widespread 0.5" to 1" of rainfall is expected with higher amounts possible where stronger storms frequent. Strongest storms will be capable of large hail and damaging winds (<15% chance) mainly Tuesday evening and night. Cooler temperatures and dry conditions expected through the rest of the week and into the weekend.