We took the White Pass train in the early morning (first train out) and the weather was clear and perfect. This was in August and we'd caught good weather. I have read however that there is more possibility of mist in the morning. Maybe we were lucky.
We loved the trip. I spent almost the whole return trip in between cars and enjoying the sights and fresh air.
Ive heard you could be fogged in either morning or afternoon..Im going early too,so I hope its clear.I wonder what happens if its foggy going up and clear coming back..bet the ones going up dont want to switch sides!