Philadelphia weather in August
Philadelphia in August averages 25°C (77°F), 109 mm of rain and 9.2 hours of sun a day.
Of the twelve months in Philadelphia, August is the second warmest, the third wettest and the sunniest.
- Average temp
- 25°C (77°F)
20–30°C · 69–86°F
- Rainfall
- 109 mm
Showers likely
- Sunshine
- 9.2 h
hours per day
- Wind
- 13 km/h
What is Philadelphia like in August?
Daytime
Days are warm, typically in the mid-20s°C or above.
Rain
Some rain is likely; pack for showers.
Evening
Evenings stay warm.
What should I pack for Philadelphia in August?
High-factor sun cream
With 9.2 hours of sun a day, burn time is short even in shade.
Sunglasses and a brimmed hat
Midday glare is the part people underpack for, not the heat itself.
Loose cotton or linen
Synthetics stop working once you are sweating through them all day.
A refillable water bottle
Daily highs this warm need roughly double the water a temperate day does.
A light rain jacket
About 109 mm falls this month — showers rather than washouts.
August compared with July and September
August in Philadelphia is 1°C cooler than July and about as wet as it, which averages 26°C (79°F).
August in Philadelphia is 3.9°C warmer than September and about as wet as it, which averages 21°C (70°F).
Daylight in Philadelphia in August
On 15 August the sun is up for 13 hours 44 minutes in Philadelphia, rising about 06:12 and setting about 19:56 local time.
August ends 1 hour 9 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 1 hour 16 minutes short of June, the longest-lit month here.
Where to stay in Philadelphia
Dates are a starting point for August.
Travel guides for Philadelphia
What to read before you book.
Philadelphia weather by month
TemperatureRainfall
How August compares with the rest of the year
August is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 1°C / 34°F | 79 mm |
| February | 2°C / 36°F | 69 mm |
| March | 7°C / 44°F | 101 mm |
| April | 13°C / 55°F | 88 mm |
| May | 18°C / 65°F | 86 mm |
| June | 23°C / 74°F | 103 mm |
| July | 26°C / 79°F | 111 mm |
| August | 25°C / 77°F | 109 mm |
| September | 21°C / 70°F | 112 mm |
| October | 15°C / 58°F | 88 mm |
| November | 9°C / 48°F | 74 mm |
| December | 4°C / 39°F | 101 mm |
Similar weather in August
Other destinations whose August averages sit close to this one.
Check another month
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FAQs about Philadelphia in August
August climate averages for Philadelphia, 1991–2020.
Philadelphia averages 25°C (77°F) in August, ranging from about 20°C (69°F) at night to 30°C (86°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 109 mm falls across August, enough to need a light jacket but not enough to reshape a trip.
Yes. August averages 25°C (77°F) against 21°C (70°F) in September — 3.9°C warmer.
August is 1°C cooler than July, and about as wet.
Yes. August falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 9.2 hours of sun a day on the 1991–2020 average — among the brighter months anywhere.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what August is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 13 hours 44 minutes of daylight in mid-August, against 15 hours in June and 9 hours 21 minutes in December.
On 15 August, sunrise is about 06:12 and sunset about 19:56 local time. Both shift across the month — the month ends 1 hour 9 minutes shorter than it starts.
