August weather forecast
Philadelphia, PA

The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania

Weather in August

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

Temperature

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

Heat index

In August, the average heat index is calculated to be a tropical 91.4°F (33°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, differences in body mass, height, and shape, metabolic differences), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

April and August, with an average relative humidity of 71%, are the least humid months.

Rainfall

August is the month with the most rainfall in Philadelphia, Pennsylvania. Rain falls for 13.3 days and accumulates 1.65" (42mm) of precipitation.

Snowfall

June through October are months without snowfall.

Ocean temperature

With an average ocean temperature of 75.9°F (24.4°C), August is the month with the warmest seawater.
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).

Daylight

The average length of the day in August is 13h and 42min.
On the first day of August in Philadelphia, sunrise is at 5:59 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 6:27 am and sunset at 7:34 pm EDT.

Sunshine

In August, the average sunshine is 10.2h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in August in Philadelphia?

In Philadelphia, Pennsylvania, in August, the average high-temperature is 84°F (28.9°C), and the average low-temperature is 68°F (20°C). in August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is calculated to be 91.4°F (33°C).

What is the least humid month in Philadelphia?

April and August, with an average relative humidity of 71%, are the least humid months in Philadelphia.

What is the average humidity in August in Philadelphia?

In Philadelphia, Pennsylvania, the average relative humidity in August is 71%.

What is the rainiest month in Philadelphia?

August is the month with the most rainfall in Philadelphia, Pennsylvania. Rain falls for 13.3 days and accumulates 1.65" (42mm) of precipitation.

How many days does it rain in August in Philadelphia?

In Philadelphia, Pennsylvania, in August, during 13.3 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

When it does not snow in Philadelphia?

In Philadelphia, snow does not fall in June through October.

What is the month with the warmest ocean in Philadelphia?

The month with the warmest seawater is August, with an average ocean temperature of 75.9°F (24.4°C).

What is the ocean temperature in August in Philadelphia?

In Philadelphia, in August, the average water temperature is 75.9°F (24.4°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 75.9°F (24.4°C) water.

What is the average length of the day in August in Philadelphia?

In August, the average day length in Philadelphia is 13h and 42min.

When is the sunrise / sunset in August in Philadelphia?

On the first day of August in Philadelphia, Pennsylvania, sunrise is at 5:59 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 6:27 am and sunset at 7:34 pm EDT.

How long on average sun shines in August in Philadelphia?

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

What are the months with the highest UV index in Philadelphia?

The months with the highest UV index in Philadelphia are May through August, with an average maximum UV index of 6.

What is the UV index reading in August in Philadelphia?

In August, the average daily maximum UV index in Philadelphia, Pennsylvania, is 6. A UV Index of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Philadelphia, PA

Average temperature in August - Philadelphia, PA
  • Average high temperature in August: 84°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in August: 68°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).

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Average pressure in August
Philadelphia, PA

Average pressure in August - Philadelphia, PA
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in August
Philadelphia, PA

Average wind speed in August - Philadelphia, PA
  • Average wind speed in August: 5.6mph

The windiest months (with the highest average wind speed) are March and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in August
Philadelphia, PA

Average humidity in August - Philadelphia, PA
  • Average humidity in August: 71%

The month with the highest relative humidity is October (77%).
The months with the lowest relative humidity are April and August (71%).

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Average rainfall in August
Philadelphia, PA

Average rainfall in August - Philadelphia, PA
  • Average rainfall in August: 1.65"

The wettest month (with the highest rainfall) is August (1.65").
The driest months (with the least rainfall) are January and February (0.83").

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Average rainfall days in August
Philadelphia, PA

Average rainfall days in August - Philadelphia, PA
  • Average rainfall days in August: 13.3 days

The month with the highest number of rainy days is July (14.8 days).
The month with the least rainy days is February (7.2 days).

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Average snowfall in August
Philadelphia, PA

Average snowfall in August - Philadelphia, PA
  • Average snowfall in August: 0"

The month with the highest snowfall is February (0.98").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in August
Philadelphia, PA

Average snowfall days in August - Philadelphia, PA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in August
Philadelphia, PA

Average sea temperature in August - Philadelphia, PA
  • Average sea temperature in August: 75.9°F

The best month for swimming (with the highest average sea temperature) is August (75.9°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

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Average daylight in August /
Average sunshine in August
Philadelphia, PA

Average daylight in August / Average sunshine in August - Philadelphia, PA
  • Average daylight in August: 13h and 42min

The month with the longest days is June (Average daylight: 14h and 58min).
The month with the shortest days is December (Average daylight: 9h and 23min).

  • Average sunshine in August: 10h and 12min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in August
Philadelphia, PA

Average sunshine days in August - Philadelphia, PA
  • Average sunshine days in August: 15.2 days

The month with the most sunshine days is December (20.9 days).
The month with the least sunshine days is May (13.3 days).

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Average UV index in August
Philadelphia, PA

Average UV index in August - Philadelphia, PA
  • Average UV index in August: 6

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in August
Philadelphia, PA

Average cloud cover in August - Philadelphia, PA
  • Average cloud cover in August: 32

The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in August
Philadelphia, PA

Average visibility in August - Philadelphia, PA
  • Average visibility in August: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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