The most pleasant months of the year for the 92140 zip code are August, September and July. In the 92140 zip code, there are 5 comfortable months with high temperatures in the range of 70-85°. August is the hottest month for the 92140 zip code with an average high temperature of 76.0°, which ranks it as one of the coolest places in California. Any measurable snowfall is a rare occurance in the 92140 zip code. August is the most humid month, though humidity is low for most of the year.