May
OK
22.8°C / 12.5°C
17 rain days
warm, very wet
- comfortable temperatures (avg high 22.8°C / 73°F)
- outside peak hazard season
Best time to visit Philadelphia
Philadelphia, United States — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. Every month has trade-offs — pick what you can tolerate.
Best · May & June
About Philadelphia
Philadelphia, colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania and the sixth-most populous city in the United States. Its population was 1.60 million at the 2020 census and estimated at 1.57 million in 2025.
— condensed from Wikipedia
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OK — shoulder months
June
OK
27.5°C / 17.6°C
17 rain days
warm, very wet
- outside peak hazard season
- warm evenings without humidity overload
April
OK
17.4°C / 6.7°C
17 rain days
mild, very wet
- outside peak hazard season
November
OK
12.5°C / 3.5°C
11 rain days
cool, rainy
- outside peak hazard season
March
OK
11.1°C / 0.9°C
15 rain days
cool, rainy
- outside peak hazard season
December
OK
8.1°C / 0.4°C
12 rain days
chilly, rainy
- outside peak hazard season
February
OK
7.1°C / -2.4°C
14 rain days
chilly, freezing nights, rainy
- outside peak hazard season
Months to skip
July
Skip
30.4°C / 21°C
19 rain days
hot, very wet
- very hot (30.4°C)
- extremely wet (19 rain days)
January
Skip
4.8°C / -3.5°C
14 rain days
cold, freezing nights, rainy
- freezing at night (-3.5°C)
- heavy rain expected (14 days)
September
Skip
25.9°C / 16.7°C
14 rain days
⚠ peak season
warm, rainy
- heavy rain expected (14 days)
- peak hurricane season
October
Skip
19.5°C / 10.7°C
15 rain days
⚠ peak season
mild, rainy
- heavy rain expected (15 days)
- peak hurricane season
August
Skip
29.2°C / 20.1°C
18 rain days
⚠ peak season
hot, very wet
- extremely wet (18 rain days)
- peak hurricane season
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.