Iowa Gears Up for Extreme Heat and Rapid Onset Drought

Iowa is heading toward a stretch of early summer heat, and forecasters say it could feel more like mid-July than early June with temps skyrocketing into the 90s.

Get our free mobile app

The latest outlook from the NOAA Climate Prediction Center shows a strong signal for above-normal temperatures across the Upper Midwest from June 5th through 11th. That means daytime highs pushing into the upper 80s and low 90s across much of Iowa. When you factor in humidity, it will feel even hotter. Heat index values could climb into the mid to upper 90s during the warmest afternoons.

The setup behind this pattern is a large area of high pressure building over the central United States. High pressure tends to suppress cloud cover and limit rainfall. At the same time, winds from the south will pull warm, moist air north from the Gulf of Mexico. That combination drives up both temperature and humidity. You can view the NOAA Climate Prediction Center’s extended outlook here.

While the heat is the most noticeable impact, dryness is also becoming a concern. Parts of the Middle and Upper Mississippi Valley, including Iowa, are now flagged for potential rapid drying conditions. This is often called “rapid-onset drought,” where soil moisture can drop quickly when heat rises and rain chances stay limited.

This weather pattern could stress crops, especially early-season corn and soybeans. It could also increase irrigation demands and reduce soil moisture heading into mid-June. In these conditions, rivers and streams may also see slower recovery if rainfall stays limited.

The biggest thing is heat safety with these early summer temperature spikes. People should plan for more frequent breaks if working outdoors. Make sure to be drinking lots of water, especially during peak afternoon hours when the humidity is highest.
Forecasters will refine the outlook as the week approaches, but confidence is growing that Iowa will see a hot, humid, and increasingly dry start to June; not ideal for our already dry fields.