Philadelphia weather in January
January in Philadelphia: cold, rainy, with clean air — a fair time to visit.
#12 of 12 months in Philadelphia · #432 of 604 destinations to visit in January · comfort 56/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Philadelphia climate normals — January
| Daytime high | 6°C / 43°F | 🧥 cold |
|---|---|---|
| Nighttime low | -1°C / 30°F | |
| Feels like (high) | 2°C / 36°F | |
| Rainfall | 81 mm / 3.2 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 67% | 💧 humid |
| Dew point | -4°C / 25°F | |
| Sunshine | 6 h/day | |
| Daylight | 9.7 h | |
| Wind | 19 km/h / 12 mph | |
| Snowfall | 8.5 cm / 3.3 in | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Philadelphia in January — FAQ
- Is January a good time to visit Philadelphia?
- January in Philadelphia: cold, rainy, with clean air — a fair time to visit. It ranks #12 of 12 months for Philadelphia on SeasonMap's comfort score (56/100).
- What is the weather like in Philadelphia in January?
- In January, Philadelphia averages a daily high of 6.1°C and a low of -1°C, with about 81.2 mm of rain over roughly 10.2 rainy days.
- What is the air quality in Philadelphia in January?
- Philadelphia has a mean US Air Quality Index of about 45 in January.
- Does it snow in Philadelphia in January?
- Philadelphia sees roughly 8.5 cm of snowfall in January.