Philadelphia month by month
Plan your visit to Philadelphia by month. Compare weather, crowds, events, and prices across all twelve months with historical climate data.
Philadelphia's measured year divides into four bands. January and February hold at 5°C and 7°C with 10 rain days each, a flat cold floor that December at 8°C nearly matches. From March through May, the average high rises from 13°C to 23°C, gaining 10 degrees in 3 months, though rain days remain between 9 and 12. June reaches 29°C. July records 31°C with 14 rain days, the highest readings on both measures. August holds at 30°C with 11 rain days. By October, the average high falls to 20°C and rain days drop to 7, the driest point in Philadelphia's calendar. November drops to 13°C, matching March.
TTDI publishes 12 month guides for Philadelphia beneath this index. For mild, dry conditions, open October first. Its 20°C high and 7 rain days have no close rival in the measured year. The June through August pages cover heat above 29°C, with rain counts between 10 and 14. Spring visitors should read March, April, and May together, since the temperature shifts 10 degrees across those 3 months. January and February differ by 2 degrees and share 10 rain days, so either guide covers Philadelphia's coldest stretch.
July is Philadelphia's most decisive month, recording both the year's highest temperature at 31°C and its highest rain count at 14 days.
- January
- High
- 5°C
- Low
- -3°C
- Rain
- 86 mm
January in Philadelphia is cold and raw. That's the first thing you need to know. Average highs sit around 5°C (41°F), lows dip to -2.6°C (27°F), and the wind off the Delaware…
- February
- High
- 7°C
- Low
- -2°C
- Rain
- 80 mm
February is Philadelphia's coldest full month, and you should know that upfront. Average highs hover around 7°C (45°F), lows dip to -2°C (29°F), and the wind off the Delaware River…
- March
- High
- 13°C
- Low
- 2°C
- Rain
- 122 mm
March in Philadelphia is a weather roulette wheel. That's the honest headline. You might get a 18°C (65°F) afternoon where everyone floods Rittenhouse Square in shirtsleeves, or…
- April
- High
- 18°C
- Low
- 7°C
- Rain
- 116 mm
April is when Philadelphia finally shakes off winter, though the city seems to change its mind about it every other day. Afternoon temperatures typically reach 18°C (65°F), but…
- May
- High
- 23°C
- Low
- 12°C
- Rain
- 111 mm
May is when Philadelphia stops hedging and commits to spring. Daytime highs settle around 23°C (74°F) and lows hover near 12°C (54°F), which means you can walk from the Liberty…
- June
- High
- 29°C
- Low
- 18°C
- Rain
- 79 mm
June is when Philadelphia's outdoor season opens in full, and the single most important thing to know is that the city fits into a comfortable window between spring's lingering…
- July
- High
- 31°C
- Low
- 21°C
- Rain
- 114 mm
July in Philadelphia means one thing above all else. This is where American independence was declared on July 4, 1776, and the city still treats that date like its personal…
- August
- High
- 30°C
- Low
- 20°C
- Rain
- 106 mm
August in Philadelphia is defined by heat and humidity. Daytime temperatures typically hover around 30°C (85°F), and 68% average humidity turns the air thick enough that you feel…
- September
- High
- 26°C
- Low
- 17°C
- Rain
- 102 mm
September might be Philadelphia's best-kept secret among East Coast travel months. The oppressive July and August humidity finally loosens its grip, daily highs settle around 26°C…
- October
- High
- 20°C
- Low
- 11°C
- Rain
- 80 mm
October is likely the single best month to visit Philadelphia. Daytime highs average 20°C (68°F), the thick summer humidity has finally broken, and Fairmount Park's 2,050 acres…
- November
- High
- 13°C
- Low
- 4°C
- Rain
- 64 mm
November in Philadelphia means the cold has arrived for real. Daytime highs average 13°C (56°F), lows settle around 4°C (40°F), and by mid-month the sun sets before 5 PM. Fairmount…
- December
- High
- 8°C
- Low
- 0°C
- Rain
- 99 mm
December in Philadelphia is defined by cold. Average highs sit around 7.5°C (46°F), lows dip to -0.2°C (32°F), and the wind off the Delaware River adds a chill that the thermometer…