Average temperatures, rainfall and packing tips for Philadelphia, United States in January
January in Philadelphia is typically cold, with average daytime highs around 6°C and nights near -2°C. It is usually the coldest month of the year in Philadelphia.
January is one of the wetter months in Philadelphia, with around 159 mm of rain - plan around showers.
If your dates are flexible, the most comfortable months in Philadelphia are usually May, August, September and October.
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In January, Philadelphia averages a daytime high of about 6°C and a night-time low of around -2°C, based on recent historical data. That makes it the coldest month of the year there.
January is one of the wetter months in Philadelphia, with around 159 mm of rain - plan around showers.
January is cold in Philadelphia. City sightseeing works fine if you dress for it, but pack properly and expect short days. If your dates are flexible, the most comfortable months in Philadelphia are usually May, August, September and October.