"Overcast weather" refers to a condition when the sky is cloudy, and there is a thick cover of clouds above that blocks out the sunlight. Full definition
This time last year it was miserably hot & humid, so I was happy with our 1 - 2 days of rain and mostly overcast weather for the majority of my time there. (sosageblog.com)
In the seas north of Alaska an interesting balance is struck between comparatively mild ice conditions (well below normal multiyear ice levels and early onset of ice decay) and cool, overcast weather conditions that are not very conducive to early melt. (searcharcticscience.org)