The northern lights (aurora borealis) are visible tonight, September 16, 2025, primarily across high northern latitudes and certain northern parts of the United States. According to NOAA and other sources:

• Northern lights are expected in northern Michigan's Lower Peninsula and Upper Peninsula.
• They could also be visible across as many as nine states in the northern US, including parts of Washington, Idaho, Wyoming, the Dakotas, Wisconsin, Michigan, and Maine.
• The aurora might be visible in northern Canada and Alaska, and there is a chance for sightings as far south as central Wisconsin.
• The geomagnetic activity is moderate (Kp index around 4 to 5), which increases the chances of seeing them tonight, especially in areas with low light pollution.
• Strong solar wind from a coronal hole and geomagnetic storms are contributing to this visibility.
• The best viewing conditions are clear, dark skies away from city lights.

For those in northern Europe or Scandinavia, places like Tromsø, Norway remain top locations to see the northern lights, but this is more typical for high- latitude regions. In summary, the northern lights can be seen tonight best in northern parts of the US around the Great Lakes region, northern Canada, Alaska, and high-latitude areas of Scandinavia if skies are clear.