The most pleasant months of the year for the 90831 zip code are July, September and August. In the 90831 zip code, there are 8 comfortable months with high temperatures in the range of 70-85°. August is the hottest month for the 90831 zip code with an average high temperature of 80.1°, which ranks it as cooler than most places in California. Any measurable snowfall is a rare occurance in the 90831 zip code. August is the most humid month, though it is still relatively mild compared to many other places.