San Diego Weather In August 2025. Temperature, high temperature, low temperature, precipitation, daily sun hours, sea temperature. Get the monthly weather forecast for san diego, ca, including daily high/low, historical averages, to help you plan ahead.

This report illustrates the typical weather in san diego, based on a statistical analysis of historical hourly weather reports and model reconstructions from january 1, 1980 to december 31,. San diego august weather guide.