San Diego's climate is a desert , San Diego gets its water from 3 different places. San Diego gets the most percent of water from the Colorado river. San Diego also get its water from the State Water Project and from local resources. The plan for the year 2050 is to recycle water and desalinate the salt water from the oceans. The main reason for the increase demand and lower supplies its because of the droughts , But also because the number of population.