Oct 21, 2017 - 2:51 AM
in reply to grubern
Probably not. The main problem is not the rain itself (although raindrops on the window spoil the view for photos), but the mist and fog.
I have been on that trip several times, in the snow, in the sunshine and in the rain. On the rainy day, going across the highest part of the route, the mountain tops were in the clouds, so you couldn't tell how magnificent they were. At Alp Grüm, the fog competely obscured the beautiful view of the valley and lake below as well as the glacier above.
The lower part of the route, after descending to Le Prese, was clearer.
You could do a google search for webcams at Alp Grüm and Ospizio Bernina to check conditions on the day.