Weather In Philadelphia In January 2025 Hourly. Weather ☀ ⛅ philadelphia ☀ ⛅ january ☀ ⛅ information on temperature, sunshine hours, water temperature & rainfall in january for philadelphia. November 2024 to october 2025 winter temperatures will be above normal, with precipitation slightly below normal.

January is in the winter in philadelphia and is typically the coldest month of the year. In philadelphia, in january, the average water temperature is 41.9°f (5.5°c).