Winter comes early . . .
I remember entering Alaska from the Top of the World Hwy (all dirt and gravel then, now paved for big tour buses) from Dawson City on 3 September in '93.
In Anchorage I commented that we'd seen very few motorbikes. The local said, "they're all gone by now - this is Alaska". The Yukon, being inland is even colder. We spent 2 weeks in Alaska and were chased by cold (-20C) all the way to Prince Rupert where we boarded the ferry to Vancouver Island. We were riding a K75s and an old R90.
Beautiful and not too bad with heated grips, an electric vest but . . . that's pretty late in the year. BC will be much warmer . . .
FWIW, if you decide to go . . . skip the haul road to Prudhoe Bay and ride the Dempster. It's spectacular in the fall although a little greasy in sections if there's been considerable rain. The Tombstone Valley is mesmerizing.
Orange, it's the new black.