San Antonio Weather In December 2025

San Antonio Weather In December 2025. This report shows the past weather for san antonio, providing a weather history for 2025. Expect 18°c daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in san antonio in december.

Expect 18°c daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in san antonio in december. December is in the winter in.