In our opinion, the answer to this much asked question is no.
We’ve discussed this issue with numerous Northern Lights guides and photographers and the consensus is that a full moon only impacts on a weak Auroral display and only when it is directly, or almost directly, behind that display. Indeed, the majority of Northern Lights photographers welcome the presence of a full moon as it adds another dimension to their Aurora imagery.
The thing to remember about the moon is that in relation to the vastness of space, it is absolutely tiny. Have a look at the night sky and note the miniscule fraction of that sky that is occupied by the moon. In our experience it is only weak Auroras that are diminished by the light of the moon and, very often, a weak Aurora is more frustrating than no Aurora at all because waiting and hoping for a smudge of green light to develop into something spectacular can be hugely frustrating.
If that weak Aurora is positioned directly in front of a full moon then there is likely to be a loss of clarity but, in our experience, any half decent Aurora display will remain clearly visible even when the moon is at its fullest.
A full moon in the Arctic sky is a wonder in its own right and we’d urge you not to be put off travelling because of it.
Image credit: NASA/JPL/USGS