The most pleasant months of the year for the 92278 zip code are April, October and March. In the 92278 zip code, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 92278 zip code with an average high temperature of 103.1°, which ranks it as one of the hottest places in California. Any measurable snowfall is a rare occurance in the 92278 zip code. Days with noticeable humidity are rare throughout the year.