Philadelphia, PA Weather Forecast & Climate Guide
Philadelphia has a humid subtropical climate with hot, humid summers and cool to cold winters. Located in southeastern Pennsylvania, the city experiences four distinct seasons with moderate precipitation throughout the year.
Climate type: Humid subtropical (Köppen Cfa)
Philadelphia Climate Overview
Summer highs average in the mid-80s°F (29°C) with high humidity, while winter temperatures typically range from the 20s to 40s°F (-7 to 4°C). The city receives about 42 inches of precipitation annually, including snow in winter months.
Philadelphia's weather is influenced by both continental and maritime air masses, creating variable conditions. The city can experience nor'easters, thunderstorms, and occasional severe weather. Spring and fall provide the most comfortable weather.
Philadelphia Weather by Season
spring
Spring is variable with highs climbing from the 50s°F in March to the 70s°F by May. Cherry blossoms peak in early April and outdoor cafes start filling in.
summer
Summers are hot and humid with highs in the mid-80s°F and frequent heat waves pushing past 90°F. Afternoon thunderstorms rumble through several times a month.
fall
Fall is Philadelphia at its best — mild, sunny days in the 60s°F, crisp nights, and peak foliage in mid-October. Arguably the best weather season in the city.
winter
Winters are cold with highs in the 40s°F and lows in the upper 20s°F. The city averages 22 inches of snow per year, mostly from nor'easters in January and February.
Philadelphia Average Monthly Temperatures
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 40° | 43° | 52° | 63° | 73° | 82° | 87° | 85° | 78° | 67° | 56° | 45° |
| Low °F | 25° | 27° | 34° | 44° | 54° | 64° | 69° | 68° | 60° | 48° | 39° | 30° |
Best Time to Visit Philadelphia
Mid-September through late October, or late April through early June. Both deliver mild temperatures, low humidity, and minimal rain. October brings the added bonus of peak fall foliage.
Severe Weather Risks
- Nor'easters
- Heat waves
- Hurricane remnants
- Ice storms
- Severe thunderstorms
Weather Facts About Philadelphia
- >Philadelphia sits in a transition zone between the cold Northeast and the humid South, which creates its variable weather.
- >The city averages 22 inches of snow per year, but the 2009-10 winter dropped over 78 inches.
- >Summer heat waves are often worse in Philly than NYC because the city sits further from coastal moderation.
Philadelphia Weather FAQ
When is the best time to visit Philadelphia?
October is the sweet spot — warm days in the 60s-70s°F, cool evenings, low humidity, minimal rain, and peak fall foliage. May is a close second for similar conditions before summer humidity arrives.
How much snow does Philadelphia get?
About 22 inches per year on average, but individual nor'easters can drop 10-20+ inches at a time. The historic 2009-10 winter buried Philly under nearly 80 inches total.
Does Philadelphia get hurricanes?
Direct hits are rare, but remnants of tropical storms frequently bring heavy rain and flooding. Hurricane Sandy (2012) and Ida (2021) both caused significant damage to the Philadelphia region.
Is Philadelphia humid in summer?
Yes. July and August dewpoints regularly push into the low 70s°F, which feels muggy. Heat index values above 100°F happen several times per summer.