Strong colonies have way too many bees between the combs and when humidity increases their bodies act as a barrier so the humidity is kept inside. There is also to take their respiration increasing the inner humidity levels. So the best way to deal with this issues to get out of the hive and let the ventilator bees reduce the internal humidity and bring it down to desired level. Hence bearding.
Thistles are in full bloom. "Lots" of good forage for the bees in this
danish mono-crop barren landscape