The Lower 48 just logged its hottest summer on record, NOAA says

The National Oceanic and Atmospheric Administration has confirmed that the summer of 2026 was the hottest ever recorded across the Lower 48 states, edging past marks first set during the Dust Bowl era of 1936 and matched again five years ago. The milestone caps a season in which large stretches of the West, Southwest and South endured extended runs of extreme heat that strained power grids and worsened drought conditions across multiple states.

The 74.4-degree average and how it compares with past records

NOAA’s tally puts the average temperature across the contiguous United States for meteorological summer, covering June through August, at 74.4 degrees Fahrenheit, about three degrees above the twentieth-century average for the season. That figure edges out the previous record, which had stood since 1936 and was matched again in 2021, by roughly four-tenths of a degree, a narrow margin in absolute terms but a significant one in a temperature record that stretches back to 1895. NOAA calculates the ranking from a network of thousands of weather stations across the country, a methodology that has remained largely consistent for decades and allows this summer to be compared directly against the Dust Bowl-era record rather than an adjusted or estimated figure.

August’s outsized role in the record

August carried much of the weight behind the seasonal record, averaging 75.6 degrees nationwide with daytime highs reaching 88.6 degrees, the warmest average high NOAA has logged for that measurement. Persistent high-pressure systems parked over large portions of the country through much of the month, suppressing rainfall in already dry regions while pushing daytime and overnight temperatures well above typical late-summer norms. Overnight lows also ran unusually high in several regions, a detail meteorologists note as significant because warm nights prevent the kind of overnight cooling that typically offers relief after a hot day and gives the body a chance to recover from prolonged heat exposure.

Where the heat concentrated

The West, the Southwest, the southern Rockies, the southwestern Plains and southern Florida all recorded their warmest summers on record individually, according to The Hill‘s reporting on the NOAA data. Coverage from the Washington Post mapped how the extreme heat clustered most heavily in arid and semi-arid regions already dealing with long-running drought, compounding water shortages that had built up over previous seasons. Parts of the Northeast and upper Midwest, by contrast, saw closer-to-normal summer temperatures, illustrating how a national record can mask sharp regional differences in how the heat was actually distributed across a country as large and climatically varied as the contiguous United States.

How this summer fits a longer warming trend

NOAA’s Climate at a Glance dataset, which underpins the agency’s seasonal rankings, now shows several of the warmest summers on record for the contiguous United States occurring within the past decade, a pattern consistent with the broader long-term warming trend documented in the agency’s climate monitoring program. A single record-breaking season does not by itself establish a trend, but its place alongside a cluster of recent near-record summers is part of why climate scientists point to seasons like this one as consistent with, rather than an outlier from, the broader warming signal tracked across more than a century of data.

The strain on power grids and water supplies

Extended heat of this scale drives up electricity demand for air conditioning, straining regional power grids during peak afternoon and evening hours and prompting several utilities to issue conservation appeals during the hottest stretches of August. The same conditions accelerated evaporation from soil and reservoirs in areas already short on water, deepening drought classifications in parts of the Southwest and southern Plains and adding pressure on agricultural regions that depend on stored water for late-season irrigation. Utilities and water agencies in the hardest-hit states have said the season’s demand patterns will factor into planning for infrastructure upgrades and reservoir management heading into next year.

The broader consequences of a record-hot season

Prolonged heat and dryness together tend to leave vegetation more combustible heading into the back half of the wildfire season, one of several downstream effects that agencies and utilities factor into their planning once a summer like this one is confirmed as a record. Public health officials in several of the hardest-hit states also reported increases in heat-related emergency room visits during the peak weeks of August, underscoring that a record-breaking seasonal average translates into tangible strain on hospitals, outdoor workers and vulnerable residents rather than remaining an abstract statistic confined to a climate report. Farmers in several affected states reported lower yields tied to the extended heat and dryness, adding an economic dimension to a season that has already reshaped drought maps and reservoir levels across a wide swath of the country.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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