Philadelphia weather in August
In August, Philadelphia has an average high of 30 °C85 °F and an average low of 19 °C66 °F, with about 121 mm4.7 in of precipitation. It is the 2nd warmest month of the year and ranks 3rd for precipitation.
How August compares with other months
Compared with July, August is 0.6 °C1.1 °F cooler on average. Compared with September, August is 3.6 °C6.5 °F warmer on average and wetter by 19 mm0.7 in. Daylight lasts about 13.7 hours around the middle of the month. Average relative humidity is 74% and the average cloud amount 52%.
Is August a good time to visit Philadelphia?
August is not among the most comfortable months by our comfort score: it is hot (average high 30 °C85 °F) and it is fairly wet (121 mm4.7 in). The most comfortable months in Philadelphia are May and September.
What to wear in August
For Philadelphia in August, pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
August in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Philadelphia | 3085 | 1966 | 1214.7 |
| Allentown | 2985 | 1864 | 1184.7 |
| Atlantic City | 2780 | 2170 | 1094.3 |
| Staten Island | 2984 | 1966 | 1144.5 |
| Brooklyn | 2679 | 2170 | 1144.5 |
| New York City | 2679 | 2170 | 1144.5 |
| Paterson | 2985 | 1865 | 1194.7 |
| Manhattan | 2984 | 1966 | 1144.5 |
| Baltimore | 3087 | 2068 | 1064.2 |
Other months in Philadelphia
- January3 °C38 °F / −5 °C23 °F
- February5 °C41 °F / −4 °C24 °F
- March10 °C50 °F / −1 °C31 °F
- April17 °C63 °F / 5 °C41 °F
- May22 °C72 °F / 11 °C52 °F
- June27 °C81 °F / 17 °C62 °F
- July30 °C86 °F / 20 °C67 °F
- August30 °C85 °F / 19 °C66 °F
- September26 °C79 °F / 15 °C59 °F
- October19 °C67 °F / 8 °C47 °F
- November12 °C54 °F / 2 °C36 °F
- December7 °C44 °F / −2 °C28 °F
Frequently asked questions
How warm is Philadelphia in August?
In August the average high in Philadelphia is 30 °C (85 °F) and the average low is 19 °C (66 °F).
Does it rain a lot in Philadelphia in August?
On average about 121 mm (4.7 in) of precipitation falls in August; it ranks 3rd of the 12 months.
Is August the warmest month in Philadelphia?
No. The warmest month in Philadelphia is July, with an average high of 30 °C (86 °F). The coldest month is January, with an average low of -5 °C (23 °F).
How long is the day in Philadelphia in August?
In the middle of August the day in Philadelphia lasts about 13.7 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Philadelphia in August?
The average relative humidity in August is about 74%. Combined with warm days, it can feel muggy.
How cloudy is Philadelphia in August?
On average about 52% of the sky is covered by cloud in August. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.