The most pleasant months of the year for the 91608 zip code are October, June and May. In the 91608 zip code, there are 7 comfortable months with high temperatures in the range of 70-85°. August is the hottest month for the 91608 zip code with an average high temperature of 86.3°, which ranks it as cooler than most places in California. Any measurable snowfall is a rare occurance in the 91608 zip code. There are few days during the summer when the humidity becomes unpleasant.