While it is possible to see the Northern Lights in Oslo, Bergen, or Trondheim, it is not as common or as spectacular as in more northern regions of Norway. These cities are located further south and do not fall within the Arctic Circle, where the Northern Lights are more frequently visible.
In Oslo, Bergen, and Trondheim, the Northern Lights are usually seen during periods of strong solar activity and under favorable conditions, such as clear, dark skies away from light pollution. When visible in these cities, the Northern Lights often appear as faint, greenish or whitish streaks or curtains in the night sky.
To increase your chances of seeing the Northern Lights, it is recommended to travel to more northern regions of Norway, such as Tromsø or Lofoten, where the Aurora Borealis is more reliably and spectacularly displayed during the winter months.