Fall Chill Grips the East While Record Heat Bakes the West

A major temperature divide is unfolding across the United States as millions experience a true taste of fall while parts of the West continue to deal with summer-like heat. A surge of cooler air has spread across much of the central and eastern United States, sending temperatures tumbling and bringing some of the chilliest conditions of the season so far. Meanwhile, unusually hot weather continues across portions of the West Coast, where temperatures are running well above what is typical for early October. 

Summer Hangs On in the West 

While jackets are coming out farther east, residents across portions of the West are still dealing with significant heat. 

Temperatures across parts of California and the interior West are running roughly 10 to 15 degrees above average in some locations. Triple-digit temperatures have even been recorded in portions of Southern California despite the calendar moving deeper into October. Los Angeles experienced consecutive October days with temperatures reaching at least 100 degrees, highlighting the intensity of the unusual fall heat. The persistent warmth stretches beyond Southern California, with above-average temperatures extending through portions of the Great Basin and toward the northern Rockies. 

Over the next 3 days, many cities will be near, tie, or break the current records.

Heat alerts remain in place through Friday. Los Angeles is under an extreme heat warning, meaning use caution if working outdoors and make sure to drink plenty of water.

Check out temperatures in Los Angeles: the average high is normally 80°, but temperatures will flirt again with the century mark even in the next few days. Temperatures will remain in the upper 90s for Las Vegas, and Phoenix will dig into the 100s.

The Northwest will also be threatening record-high temperatures. High temperatures will stay hot in most of the cities in the Northwest. These highs will be anywhere from 10-15° above average.

Meanwhile, in the Northeast, Fall Air Settles In 

A strong cold front has helped usher cooler, drier air into a large portion of the country. Behind the front, daytime temperatures are struggling to climb out of the 50s and 60s in some areas. The cooler air is especially noticeable during the overnight and early morning hours. Temperatures are dropping into the 30s and 40s across parts of the northern tier, Great Lakes and Northeast, creating the potential for frost in some of the coldest locations. 

For areas that have enjoyed a relatively warm start to fall, the change may feel especially dramatic. The arrival of the cooler air is also pushing temperatures below seasonal averages across portions of the central and eastern U.S., signaling a more traditional October weather pattern. 

A Coast-to-Coast Temperature Contrast 

The dramatically different conditions are creating a weather map that looks more like two different seasons. Much of the East is experiencing crisp mornings, cooler afternoons, and increasing frost potential, while parts of the West remain firmly locked in a pattern more typical of late summer. 

Eventually, the western heat is expected to ease as the weather pattern shifts. Until then, millions of Americans will continue experiencing very different versions of October depending on which side of the country they call home.

Tune in to WeatherNation for the latest on this forecast and records that break throughout the days to come.