Northern Lights Forecast for Portland

Sometimes. At 43.7°N it takes a strong storm, and what you usually get is a glow or arc low in the north. In the strongest storms the lights have been photographed from Munjoy Hill, the Western Promenade and Evergreen Cemetery inside the city. On weaker nights the city's own light hides them, and you need Bradbury Mountain or the Sebago Lake shore.

Only in a strong storm. The Cape Elizabeth parks are dark and face the open Atlantic, but the ocean there is east and south of you. Looking north from Two Lights or Kettle Cove you are looking back toward Portland and South Portland, so a faint glow on the horizon gets lost in the city light. When the aurora climbs higher, the coast works fine.

The designated ones are all well north. Katahdin Woods and Waters National Monument, east of Baxter State Park, has been an International Dark Sky Sanctuary since 2020 and is roughly four hours' drive; in winter the only plowed parking is at the North Gate. The Appalachian Mountain Club's Maine Woods east of Moosehead Lake became an International Dark Sky Park in 2021. Closer to Portland, Bradbury Mountain in Pownal and the Sebago Lake shore are the usual dark spots.

It can be, and it is about three hours up the coast from Portland. In winter the Park Loop Road is closed from December 1 to mid-April, but the Ocean Drive stretch and Jordan Pond Road stay open to vehicles, weather permitting, so there is still a way to the water and the dark.

The nights in Portland are dark all year. But the aurora rarely reaches this far south: only in strong storms, which can come in any month. The longest nights, around 21 December, have about 13 hours of darkness.

Yes. The nights in Portland are dark all year, so the aurora can show in summer too when it reaches this far south.

In Portland, you usually need at least Kp 7 to have a reasonable chance of seeing the northern lights. Lower Kp can still bring a faint aurora display low on the northern horizon, but it is less common.

This is based on magnetic latitude, and Kp index is a global geomagnetic index, so treat it as a rule of thumb, not a location-specific guarantee.

Tonight, the NOAA Kp index forecast is 1.3 to 1.7. That is below the usual Kp index threshold for Portland, so seeing the aurora is unlikely.