Summer may end on a cooler note for parts of the U.S., with meteorologists suggesting that a weakened polar vortex could usher in below-average temperatures as September begins.

Why It Matters

In contrast to earlier in the summer, when heat waves baked large areas of the country and triple-digit temperatures prompted widespread heat alerts, forecasts shared online predict colder weather in the month ahead.

What To Know

A forecast map shared on X by meteorologist Ryan Maue for the period August 27 to September 10 suggested a broad swath of the country could see cooler than normal temperatures.

In a separate post, meteorologist Mark Margavage explained that a weak polar vortex in September could be partly responsible for "early cold outbreaks."

AccuWeather lead long-range forecast

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