Philadelphia Weather in August

In Philadelphia, August brings high daytime temperatures around 30°C (86°F), with nights cooling to 20°C (68°F). It is the wettest month of the year, so expect more rainfall than usual.

Rainfall in Philadelphia in August

During the wettest month of the year, an umbrella can be your best friend to stay dry. Historically, August sees about 10 days of rain, with a monthly average of 132 mm (5.2 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Philadelphia in August

Philadelphia in August gets highs of 30°C (86°F) during the day and drops to 20°C (68°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 20°C (68°F), evenings stay pleasantly warm.

Sunshine in Philadelphia in August

Expect sunny days throughout the month, with an estimated 260 hours of sunshine. This makes it a pleasant time to visit Philadelphia.

Average water temperature in August

At 25°C (77°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.

If you prefer dry days with pleasant temperatures, May typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Philadelphia's climate page.

Philadelphia Temperature in August

Min Temperature 20°C (68°F)  

Max Temperature 30°C (86°F)  

Water Temperature 25°C (77°F)  

Chance of Rain 34%  

Precipitation 132 mm (5.2 in)  

Rainy days 10 days  

Humidity 70%  

Sunshine 260 hours  

Percentage Sunshine 61%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Philadelphia typically stay consistent throughout August, with daily highs averaging around 30°C (86°F). Nights are warm, with lows typically ranging from 19°C (66°F) to 22°C (72°F).

Average temperatures in August

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in August

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Historical weather for Philadelphia in August

Browse day-by-day weather records for Philadelphia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Philadelphia historical weather extremes in August

Based on 49 years of weather observations in Philadelphia between 1976 and 2025, these are the recorded extremes.

• The warmest day in August was on August 9, 2001, with a maximum of 38°C (100°F).
• On August 21, 2007, Philadelphia saw its coldest August day with temperatures maxing out at 17°C (63°F).
• The coldest night in August in Philadelphia was on August 29, 1986, with a minimum of 7°C (45°F).

What to Wear in Philadelphia in August

Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. The water temperature sits at about 25°C (77°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Philadelphia in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Philadelphia's climate page.

More climate data for Philadelphia

Temperature Rainfall Sunshine Humidity Water Temp

See the full Philadelphia climate overview or explore weather in the United States of America.