The most pleasant months of the year for the 94128 zip code are September, August and October. In the 94128 zip code, there are 1 comfortable months with high temperatures in the range of 70-85°. September is the hottest month for the 94128 zip code with an average high temperature of 70.7°, which ranks it as one of the coolest places in California. Any measurable snowfall is a rare occurance in the 94128 zip code. There are few days during the summer when the humidity becomes unpleasant.