Northern lights on ncl Alaska cruise?

I'm looking at 2 cruises on Norwegian from Seattle to Alaska for Sept 2019. One is 7 day Alaska w/glacier bay Sept 22-29 and the other is 7 day Alaska w/Sawyer glacier Sept 21-28. Has anyone heard of northern lights sightings on these cruises around this time of the year?

Thanks!!

To see Northern Lights you need clear, dark skies with aurora activity. Coming in late September will you give you dark skies if you are willing to stay up late enough. Clear skies and aurora activity is random luck.