There are several causes of dehydrated skin. In most cases, skin dehydration is the result of a weakened barrier that allows too much moisture to evaporate. Environmental factors such as air conditioning, artificial heat, dry climates with low humidity, hot showers, and harsh skincare products can contribute to dehydrated skin. Lifestyle can play a role as well, since dehydrated skin can result from drinking too little water, lack of sleep, alcohol consumption, and more.