San Diego Weather In December 2025

San Diego Weather In December 2025. Check accurate weather in december in san diego (ca). Southern california weather force has issued the final forecast for the months spanning from november 2024 to may 2025 for the precipitation and temperature factors associated with the coming la nina.


San Diego Weather In December 2025

San diegans know we have it good when it comes to winter: The average high temperature in december is 63.3° and the nighttime low is 52.7°.

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