You generally cannot see the northern lights well when it’s fully cloudy, but you can sometimes see them through thin or broken clouds if the aurora is strong.

Basic answer

  • A completely overcast, thick cloud layer will usually block the aurora from view.
  • Thin, high, or patchy clouds can still let some of the glow through, especially during strong geomagnetic activity.
  • Cameras (long exposure on a DSLR or good phone) can often detect auroras through haze or thin cloud better than the naked eye.

How clouds affect visibility

  • Auroras occur 70–400 km above Earth, far above any weather clouds, but the cloud deck sits between you and the lights like a curtain.
  • A thin or fog-like layer may soften and dim the aurora, reducing the “wow” factor even if you can still see color or movement.
  • With solid low and mid‑level cloud cover, forecasts explicitly note that the spectacle “requires dark and partly clear skies,” meaning your chances drop sharply.

When you still have a chance

  • If forecasts show some breaks or partial cloud, you can see auroras through gaps or where the cloud is thinner, especially in high-activity periods.
  • Cloud layers are often very local; a short drive can take you from overcast to clearer skies and dramatically improve your odds.
  • Even if the forecast looks cloudy, experts recommend not giving up, watching satellite/cloud maps, and being ready to move location.

Practical tips for cloudy nights

  • Check both aurora and cloud-cover forecasts; look for areas with lower cloud and higher activity.
  • Drive away from coastal “moody” weather or local fog into inland or higher, drier areas where skies are often clearer.
  • Go to the darkest possible spot away from city lights, and use a tripod with long exposures to let your camera reveal what your eyes might miss.

Quick takeaway

  • Fully cloudy: chances are very low; you usually need at least partly clear skies.
  • Partly cloudy or thin cloud and strong aurora: you can still see something, though it will be dimmer and less dramatic than under a clear sky.

Information gathered from public forums or data available on the internet and portrayed here.