The northern lights may return to the night sky over Canada and parts of the United States tonight, forecasters said.

An eruption from the sun, known as a coronal mass ejection, occurred over the weekend and is expected to impact the Earth's magnetic field late Monday into early Tuesday, NOAA's Space Weather Prediction Center said. When it happens, it will set off a colorful display of the aurora borealis.

A view of the Milky Way as Northern Lights were visible at Lake Berryessa in Napa Valley, California, United States on June 3, 2025. Tayfun Coskun/Anadolu via Getty Images

People in 18 U.S. states could see the green or red glow of the aurora in the sky Monday night.

According to weather forecasters, the upcoming light show is not expected to be as significant as those seen ac

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