A novel maize variety designated PHW6G and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PHW6G with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PHW6G through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. Hybrid maize seed, plant or plant part produced by crossing the variety PHW6G or a locus conversion of PHW6G with another maize variety.