August weather philadelphia

August weather philadelphia DEFAULT

August Weather in Philadelphia Pennsylvania, United States

Daily high temperatures decrease by 4°F, from 86°F to 82°F, rarely falling below 74°F or exceeding 94°F.

Daily low temperatures decrease by 4°F, from 70°F to 65°F, rarely falling below 57°F or exceeding 75°F.

For reference, on July 21, the hottest day of the year, temperatures in Philadelphia typically range from 70°F to 87°F, while on January 30, the coldest day of the year, they range from 26°F to 40°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Tbilisi, Georgia (5,665 miles away) is the far-away foreign place with temperatures most similar to Philadelphia (view comparison).

Compare Philadelphia to another city:

The month of August in Philadelphia experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 38% throughout the month.

The clearest day of the month is August 31, with clear, mostly clear, or partly cloudy conditions 64% of the time.

For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on September 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Philadelphia, the chance of a wet day over the course of August is very rapidly decreasing, starting the month at 36% and ending it at 28%.

For reference, the year's highest daily chance of a wet day is 37% on July 29, and its lowest chance is 22% on January 28.


To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during August in Philadelphia is gradually decreasing, starting the month at 3.8 inches, when it rarely exceeds 5.8 inches or falls below 1.6 inches, and ending the month at 3.4 inches, when it rarely exceeds 5.6 inches or falls below 1.4 inches.

The lowest average 31-day accumulation is 3.4 inches on August 31.


August weather forecast and climate
Philadelphia, PA

Weather in August

August, the last month of the summer, in Philadelphia, is another warm month, with average temperature varying between 68°F (20°C) and 84°F (28.9°C).


In Philadelphia, the average high-temperature is practically the same as in July - a warm 84°F (28.9°C). The average low-temperature, is 68°F (20°C).

Heat index

The average heat index is evaluated at a hot 90.9°F (32.7°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, differences in body mass, height, and shape, pregnancy, and metabolic differences affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.


Months with the lowest humidity are April and August, with an average relative humidity of 71%.


The month with the most rainfall is August when the rain falls for 13.3 days and typically aggregates up to 1.65" (42mm) of precipitation.


June through October are months without snowfall in Philadelphia.

Ocean temperature

With an average ocean temperature of 75.9°F (24.4°C), August is the month with the warmest seawater in Philadelphia, Pennsylvania.
Note: For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 75.9°F (24.4°C).


In August, the average length of the day in Philadelphia is 13.7h.


In August, the average sunshine in Philadelphia, Pennsylvania, is 10.2h.

UV index

Months with the highest UV index in Philadelphia are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

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Philadelphia Weather in August

What's the weather like in Philadelphia (Pennsylvania) in August 2021?

The climate in Philadelphia during August can be summarized as hot, humid and damp.

August is in the summer in Philadelphia and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 29°C (85°F), whilst at night 18°C (65°F) is normal.

Daytime temperature29.3°C84.7°F
Nightly temperature18.1°C64.6°F
Average temperature23.7°C74.7°F
Daily sunshine9 hrs
Avg rainfall114 mm4.5 ins
Rainy days9 days
Sea temperature23.4°C74.2°F
Windspeed13.7kph9 mph

On average August is the 2nd wettest month of the year in Philadelphia with around 114mm4.5 inches of rain making it a damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 9 hours of sunshine per day.

August temperatures in Philadelphia

August rainfall

August hourly sunshine

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Philadelphia in August 2021.

Philadelphia Weather: Sweater Weather Continues

Philadelphia Weather and Climate in August

Avg. Temperature °C (°F)

-0 °C

(32) °F

1.1 °C

(34.1) °F

5.4 °C

(41.7) °F

11.7 °C

(53) °F

17.2 °C

(63) °F

22.2 °C

(71.9) °F

25 °C

(76.9) °F

24.1 °C

(75.4) °F

20.5 °C

(69) °F

14 °C

(57.2) °F

8 °C

(46.4) °F

3 °C

(37.3) °F

Min. Temperature °C (°F)

-3.3 °C

(26) °F

-2.7 °C

(27.2) °F

1.1 °C

(34) °F

6.9 °C

(44.5) °F

12.5 °C

(54.5) °F

17.7 °C

(63.8) °F

20.5 °C

(69) °F

20 °C

(68) °F

16.5 °C

(61.7) °F

10.3 °C

(50.6) °F

4.6 °C

(40.3) °F

-0.1 °C

(31.9) °F

Max. Temperature °C (°F)

4.3 °C

(39.7) °F

6.2 °C

(43.1) °F

10.9 °C

(51.6) °F

17.6 °C

(63.6) °F

22.8 °C

(73) °F

27.2 °C

(81) °F

29.9 °C

(85.8) °F

28.8 °C

(83.9) °F

25.3 °C

(77.5) °F

18.6 °C

(65.5) °F

12.6 °C

(54.6) °F

7 °C

(44.7) °F

Precipitation / Rainfall mm (in)

























Humidity(%)63%60%61%61%64%67%64%66%67%68%68%67%Rainy days (d)777888887667avg. Sun hours (hours)

Philadelphia august weather

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Philadelphia Weather: Flood Warnings Continue In Spots

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