I will admit I do wish for sunshine whenever I'm traveling. Not because the conditions are enjoyable, but it makes for better photos.
Clouds and rain would ruin the scenery in many places. Not in *all* circumstances, but in most situations.
But if it is sunny, 70 or less would be preferable. Though it's not going to stop me from traveling if it's 90 either... I'll just deal with it.
Incoming system leaves much to be desired. I don’t think it’s going to be much of a rain producer except maybe early Wednesday when a def band might form but it might not make it all the way up to Seattle.
Best convective threat is tomorrow early AM plus possibly some diurnal action over the Cascades in the PM.