The northern lights could become visible across parts of the northern United States on the night of September 16 into September 17, 2026, according to the latest forecast from the National Oceanic and Atmospheric Administration’s Space Weather Prediction Center.
What to know
Forecasters expect active to G1 (minor) geomagnetic storm conditions driven by fast streams of solar wind and the residual effects of coronal mass ejections interacting with Earth’s magnetic field. A G1 storm can push the auroral oval far enough south for observers in several states near the Canadian border to see a display under dark skies.
WARNING: Geomagnetic K-index of 5 expected
— NOAA Space Weather Prediction Center (@NWSSWPC) September 15, 2026
Valid From: 2026 Sep 15 1855 UTC
Valid To: 2026 Sep 16 0600 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment:
Issue Time: 2026 Sep 15 1856 UTC
https://www.spaceweather.gov/products/alerts-watches-and-warnings
States with the best chance include Alaska, North Dakota, Minnesota, Montana, Maine, Vermont, and New Hampshire, with a fainter glow possible farther south in places such as Wisconsin, Michigan, Washington, and Idaho if activity strengthens. Visibility depends heavily on clear skies and low light pollution.
The waxing crescent moon will set early, improving viewing conditions. Skywatchers are advised to look north after dark and allow their eyes time to adjust. Phone cameras often pick up faint auroras better than the naked eye.
Based on official NOAA Space Weather Prediction Center forecasts and alerts as of September 15–16, 2026.
