Philadelphia weather in August
August is one of the best months to visit Philadelphia: highs of 29°C (85°F) and about 121 mm (4.8 in) of rain on average. Nights average 19°C (66°F) and cloud cover 52% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 2nd warmest. Compared with July, it is about as warm and about as wet; September brings highs of 26°C (79°F) and 102 mm (4.0 in) of rain.
Is August a good time to visit Philadelphia?
best month Weather score 69/100.
Yes. August is one of the best months for weather in Philadelphia.
Does it rain a lot in Philadelphia in August?
Some rain is normal: about 121 mm (4.8 in) falls in an average August. It is the 3rd wettest month of the year.
How warm is Philadelphia in August?
Days average 29°C (85°F) and nights 19°C (66°F).
Philadelphia weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 3°C (38°F) | -5°C (22°F) | 78 mm | 62% | least pleasant |
| February | 5°C (41°F) | -5°C (24°F) | 78 mm | 60% | least pleasant |
| March | 10°C (50°F) | -1°C (30°F) | 100 mm | 60% | least pleasant |
| April | 17°C (62°F) | 5°C (41°F) | 97 mm | 58% | best |
| May | 22°C (72°F) | 11°C (51°F) | 96 mm | 61% | best |
| June | 27°C (80°F) | 16°C (61°F) | 121 mm | 56% | best |
| July | 30°C (86°F) | 19°C (67°F) | 124 mm | 53% | best |
| August | 29°C (85°F) | 19°C (66°F) | 121 mm | 52% | best |
| September | 26°C (79°F) | 15°C (58°F) | 102 mm | 50% | best |
| October | 19°C (66°F) | 8°C (47°F) | 110 mm | 53% | best |
| November | 12°C (54°F) | 2°C (35°F) | 90 mm | 54% | fair |
| December | 6°C (43°F) | -2°C (28°F) | 111 mm | 63% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months