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Weather is a state of the atmosphere at a time and place while erosion is the gradual diminution of something by natural agents.
If you are talking about how weathering and erosion can affect rocks, then I absolutely will answer that but if you are not then uh oh, weathering is a chemical or physical process in which rocks exposed to the weather are worn down. Erosion is the carrying away of weathered soil, rock, and other materials on the Earth's surface by wind, water and gravity. I hope this helped by the way! :)
Erosion is the slow and gradual deterioration of rocks and minerals while weathering is the physical process/conditions that the rocks/minerals are exposed to that eventually wear it down...:)