San Diego Forecast Today 2025. Discover the most accurate weather forecast for san diego in january 2025. After a record warm day in parts of the county today cooler and cloudier weather is on tap.

As of january 1, the lowest temperature recorded in san diego, california in 2025 is 49 °f which happened on jan 1. Explore comprehensive december 2025 weather forecasts for san diego, including daily high and low temperatures, precipitation risks, and monthly temperature trends.