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Philadelphia Weather by Month
Average temperatures, rainfall and humidity for Philadelphia, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Philadelphia month looks like before you travel — then check the live Philadelphia forecast for the days ahead.
Warmest month
July
30°C average high
Coolest month
January
-3°C average low
Wettest month
June
112 mm of rain
Driest month
February
49 mm of rain
Average temperature and rainfall in Philadelphia by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 5°C | -3°C | -17°C / 19°C | 55 mm | 68% | 13 km/h |
| February | 7°C | -2°C | -23°C / 25°C | 49 mm | 67% | 14 km/h |
| March | 12°C | 2°C | -17°C / 27°C | 67 mm | 62% | 15 km/h |
| April | 18°C | 7°C | -5°C / 32°C | 84 mm | 61% | 15 km/h |
| May | 23°C | 13°C | 1°C / 36°C | 109 mm | 68% | 13 km/h |
| June | 28°C | 18°C | 8°C / 38°C | 112 mm | 68% | 11 km/h |
| July | 30°C | 21°C | 12°C / 39°C | 107 mm | 71% | 10 km/h |
| August | 29°C | 19°C | 10°C / 36°C | 93 mm | 73% | 10 km/h |
| September | 25°C | 16°C | 3°C / 35°C | 91 mm | 74% | 10 km/h |
| October | 19°C | 10°C | -2°C / 33°C | 73 mm | 72% | 12 km/h |
| November | 13°C | 4°C | -11°C / 27°C | 59 mm | 67% | 12 km/h |
| December | 8°C | 1°C | -14°C / 21°C | 77 mm | 71% | 12 km/h |
Best time to visit Philadelphia
The most comfortable time to visit Philadelphia is generally May and September to October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 975 mm a year.
Travellers who prefer heat should aim for July, when highs average 30°C. June is the month to avoid if rain would spoil your plans — it averages 112 mm, roughly 2× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Philadelphia forecast for what is happening now.