Weather in Philadelphia in August 2025
Average weather
Average temperature in Philadelphia in August
The expected average maximum temperature in August is +29°C with a maximum of +33°C and a minimum of +17°C.
The average maximum temperature goes down 6% by the end of the month, compared with the beginning of the month, from +28°C to +27°C.
Is Philadelphia warm or cold in August?
Philadelphia is typically warm in August.
Maximum temperatures go down compared to the previous month from +30°C to +29°C. The minimum temperature also goes up from +21°C to +21°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is one of the warmest months in Philadelphia, here is the comparison with other months:
Climate in Philadelphia in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +30°C | +29°C | +26°C | ||||
| Min. temperature | ||||||
| +11°C | +9°C | +4°C | ||||
| Max. temperature | ||||||
| +40°C | +38°C | +36°C | ||||
| Rainfall | ||||||
| 102 mm | 96 mm | 101 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 69% | 71% | 72% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 4 | 5 | 7 | ||||
| Cloudy days | ||||||
| 11 | 10 | 11 | ||||
| Rainy days | ||||||
| 16 | 15 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as good as in July. It’s getting colder in August. From +30°C in the day, the average maximum temperature lowers to +29°C. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 102 mm to 96 mm. Humidity rises from 69% to 71%. The average wind speed doesn’t change much during August, staying around 2 m/s. The good news is there are likely to be more sunny days in August, from 4 to 5.
September brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Philadelphia is gradually increasing during August, going from 3 m/s to 5 m/s over the course of the month.
Rain
How was the weather last August in Philadelphia?
Climate Change over Years
The climate in Philadelphia in August has not changed much over the last 43 years.
The average temperature was the lowest in 1996 (+17°C) and the highest in 2012 (+20°C). The driest year was 2001 with only 685 mm of rainfall, and the wettest year was 2023 with 1758 mm.
FAQ
Is August a good time to visit Philadelphia?
Can you sunbathe in Philadelphia in August?
Is Philadelphia rainy in August?
Is it sunny in Philadelphia in August?
Other cities in USA
Monthly weather in Philadelphia
Source of the data
For this page, we’ve looked at the typical weather in Philadelphia, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.