As a verb weather means change in color, condition, etc., because of the effects of the sun, wind, rain, etc., over a long period of time. It also means to deal with or experience (something dangerous or unpleasant) without being harmed or damaged too much.
As a noun weather is the state of the air and atmosphere at a particular time and place : the temperature and other outside conditions (such as rain, cloudiness, etc.) at a particular time and place, and bad or stormy weather. It is the state of the atmosphere with respect to heat or cold, wetness or dryness, calm or storm, clearness or cloudiness.