I have been there every hour from 4 am to 10 pm, spring, summer, fall.
Wind and weather can come into Many Glaciers from 4 possible routes, maybe more, wind being sneaky. The clouds in your photos indicate weather changes happening. At Many Glaciers, that means wind.
An indication of weather extremes at Many Glaciers, one morning three springs ago, I awoke at 5 to 40 plus MPH wind. Not much to do about photography in that sort of wind since it will blow over even compact 35mm cameras and tripods. I ignored a male grizzly within range because the wind makes for an ugly bear. At one point that day, I was rained on, sleeted on, and snowed on, all at the same time. That is Many Glaciers. Wind blowing weather in from three directions at once, and out the remaining direction.