Philadelphia weather in August
August in Philadelphia: hot, rainy — a great time to visit.
#6 of 12 months in Philadelphia · #342 of 604 destinations to visit in August · comfort 77/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Philadelphia climate normals — August
| Daytime high | 29°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 69°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 105 mm / 4.1 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 68% | 💧 humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 10.4 h/day | |
| Daylight | 13.7 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 60 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Philadelphia in August — FAQ
- Is August a good time to visit Philadelphia?
- August in Philadelphia: hot, rainy — a great time to visit. It ranks #6 of 12 months for Philadelphia on SeasonMap's comfort score (77/100).
- What is the weather like in Philadelphia in August?
- In August, Philadelphia averages a daily high of 29.2°C and a low of 20.8°C, with about 104.6 mm of rain over roughly 12 rainy days.
- What is the air quality in Philadelphia in August?
- Philadelphia has a mean US Air Quality Index of about 60 in August.