July 2026 Was Hottest Month Ever in U.S., New NOAA Data Shows

A newly released map from the National Oceanic and Atmospheric Administration (NOAA), shaded almost entirely in red, shows that July 2026 was the hottest month ever recorded across the contiguous United States. For Iowa, the data confirms a trend that farmers, families, and business owners have felt firsthand: summer heat is intensifying.

Data published Monday by NOAA's National Centers for Environmental Information (NCEI) found that the Lower 48 states averaged 76.9 degrees Fahrenheit during July. That makes it not only the warmest July on record but the hottest month of any kind since federal recordkeeping began in 1895. The previous benchmarks, set during July 1936 and July 2012, were surpassed by roughly one to two tenths of a degree.

What This Means for Iowa

Iowa's July temperatures were above average statewide, according to NOAA. While the state did not set an all-time record, the persistent heat adds to concerns about crop stress, energy demand, and public health. Iowa farmers already face challenges from volatile weather, and a hotter July means more strain on corn and soybean yields during the critical pollination period.

State climatologists and agricultural experts will be watching closely to see how this heat affects harvests. Higher nighttime temperatures, which NOAA flagged as a key concern, reduce the cooling period that crops need to recover. For Iowa's livestock producers, prolonged heat can also stress animals and increase operational costs.

Record Heat Across the Nation

The NOAA map accompanying the report illustrates the scale of the event. Above-average temperatures stretched across the entire contiguous U.S., with every state ranking within the warmest third of its historical July record. No state experienced near-average or below-average conditions.

Wyoming recorded its warmest July on record and the hottest month of any kind ever observed in that state's climate record. Average temperatures there were 5.1 degrees above normal, surpassing the previous July record set in 2007 by nearly a full degree. NOAA also reported that 13 states ranked among their five warmest Julys ever recorded.

Nighttime Temperatures a Growing Concern

Scientists say one of the most telling aspects of the July data was how warm nights became. While daytime highs averaged 89.5 degrees nationwide, the largest anomaly occurred in overnight temperatures. Average nighttime lows reached 64.2 degrees, the warmest monthly minimum-temperature reading in the federal climate record and about 3.7 degrees above average.

Climate researchers often view rising nighttime temperatures as a particularly important indicator because they can increase health risks during heat waves. Without cooler overnight conditions, the human body receives less relief from prolonged heat exposure, and electricity demand for cooling can remain elevated around the clock. For Iowa families, that means higher utility bills and greater strain on the power grid.

What's Driving the Heat?

The record-setting month adds to a growing body of evidence showing how rising global temperatures are influencing weather extremes. Scientists have repeatedly found that human-caused climate change is making heat waves more intense, more frequent, and longer-lasting. Warmer overnight temperatures are reducing opportunities for people, crops, and infrastructure to recover from daytime heat.

Last month's exceptional warmth came amid a summer marked by repeated heat domes across different regions of the country, amplifying temperatures from coast to coast. A major heat wave gripped much of the eastern U.S. around the Fourth of July holiday before additional periods of extreme heat developed later in the month across the Plains, Rockies, and Southwest.

Drought and Wildfire Risks

The heat coincided with expanding drought across portions of the West, Rockies, and northern Plains, while parts of the Pacific Northwest and western Canada battled significant wildfire activity. For Iowa, the broader picture is clear: the entire Lower 48 experienced unusually warm conditions during a month that has now entered the record books as America's hottest ever.

Frequently Asked Questions

Was July 2026 the hottest month ever in Iowa?

July 2026 was above average statewide, but Iowa did not set an all-time record. The state ranked within the warmest third of its historical July records.

How does this compare to previous record months?

The previous benchmarks were set in July 1936 and July 2012. July 2026 surpassed those by roughly one to two tenths of a degree, making it the hottest month of any kind since 1895.

What does this mean for Iowa's agriculture?

Higher temperatures, especially at night, can stress corn and soybean crops during the critical pollination period. Livestock producers may also face increased costs for cooling and water.

What can Iowans do to stay safe during extreme heat?

Stay hydrated, limit outdoor activity during peak heat, check on vulnerable neighbors, and monitor local power grid conditions. Utility companies recommend conserving energy during peak hours to avoid outages.

Contact Newsweek editors for this story: Steve Mollman and Anthony Murray.