Des Moines, Iowa – Above-average temperatures are expected across Iowa from August 5–9, bringing a prolonged stretch of summer heat while precipitation remains close to seasonal averages. Rather than a widespread wet or dry pattern, the Hawkeye State is expected to experience the typical isolated to scattered showers and thunderstorms common during early August, with rainfall totals varying considerably from one location to another.
According to the Climate Prediction Center’s 6–10 Day Outlook issued July 30, Iowa is favored to experience above-normal temperatures, while near-normal precipitation is expected across the state. The outlook supports persistent warmth and humidity with occasional thunderstorm chances but no strong signal for widespread excessive rainfall.
Des Moines and Cedar Rapids are expected to see temperatures climb above early August averages, while communities including Davenport, Sioux City, Waterloo, Dubuque, Ames, Iowa City, and Council Bluffs should experience hot afternoons with only isolated to scattered thunderstorm development. Rainfall will likely be uneven, with some communities receiving brief downpours while neighboring areas remain dry. Drivers should remain alert for changing conditions along Interstates 29, 35, 80, 235, and U.S. Highway 20, where heavier showers could briefly reduce visibility and create ponding on roadways.
The combination of above-average temperatures and increasing humidity will create muggy conditions across much of Iowa, particularly during the afternoon and early evening. Residents planning county fairs, agricultural work, sporting events, or travel should stay hydrated, take breaks from the heat, and monitor local forecasts for isolated thunderstorms that could briefly affect outdoor plans.
The overall pattern favors continued above-average warmth through August 9, with precipitation generally remaining near climatological averages across Iowa. Additional outlooks from the National Weather Service will provide greater detail on the timing and location of isolated thunderstorm chances as the period approaches.
