San Antonio Weather January 2025. Winter will be warmer than normal, with the coldest periods in late. The temperatures in san antonio in january are quite cold with temperatures between 8 ° c and 17 ° c, warm clothes are a must.

The weather in san antonio (texas) in january comes from statistical datas on the last years. Expect 16°c daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in san antonio in january.