Philadelphia Weather in January
In Philadelphia, January brings low daytime temperatures around 5°C (41°F), with nights cooling to -3°C (27°F). Expect quite a bit of snow/rainfall this month.
Rainfall in Philadelphia in January
Looking at the last 30 years, the data shows about 10 days with snow/rain, averaging 85 mm (3.3 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Philadelphia in January
In January, Philadelphia sees low temperatures, with highs of 5°C (41°F). Nights drop to around -3°C (27°F). January is in the winter season. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. With overnight lows of -3°C (27°F), temperatures fall below freezing at night. An extra thick blanket can make a real difference if your accommodation runs cold. The month is typically the coldest, so be sure to prepare by packing plenty of warm clothing.
Sunshine in Philadelphia in January
The month brings about 153 hours of sunlight, offering a comfortable mix of sun and overcast.
Average water temperature in January
At 6°C (43°F), the water is very cold. Most people find it too uncomfortable for anything beyond a brief wade.If you're looking for dry conditions and comfortable temperatures, January may not be the ideal month to visit Philadelphia. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Philadelphia's climate page.
Philadelphia Temperature in January
Min Temperature
-3°C (27°F)
Max Temperature
5°C (41°F)
Water Temperature
6°C (43°F)
Chance of Rain
33%
Precipitation
85 mm (3.3 in)
Rainy days
10 days
Humidity
66%
Sunshine
153 hours
Percentage Sunshine
52%
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in Philadelphia typically stay consistent throughout January, with daily highs averaging around 5°C (41°F). Nights are very cold, with lows typically ranging from -6°C (21°F) to -1°C (30°F).
Average temperatures in January
Daily Historical Precipitation
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Philadelphia in January
Browse day-by-day weather records for Philadelphia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Philadelphia historical weather extremes in January
According to our 49 years of weather records for Philadelphia, the following extremes were recorded between 1976 and 2025.
- Philadelphia recorded its highest January temperature of 22°C (72°F) on January 6, 2007.
- Peak precipitation in January occurred on January 23, 1998, when 51 mm (2 in) of precipitation was measured.
Best Places in the United States of America in January
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in January →
perfect weather
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What to Wear in Philadelphia in January
Cold weather calls for smart layering in January. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 6°C (43°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Philadelphia in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Philadelphia's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Philadelphia climate overview or explore weather in the United States of America.
