August Weather in Philadelphia, United States

Last updated: June 24, 2025

In August, the average temperature in Philadelphia, United States hovers around 27°C (80°F), making it a warm and inviting destination. Temperatures can vary significantly, with a minimum of 17°C (63°F) and soaring up to a maximum of 37°C (98°F). Alongside this warmth, expect 130 mm (5.1 in) of precipitation spread over 14 days, contributing to an average humidity of 77%. Plan accordingly to enjoy the unique climate of this vibrant locale!

August Temperature in Philadelphia

In August in Philadelphia, the average temperature is 27°C (80°F), with maximums reaching up to 37°C (98°F) and minimums dropping as low as 17°C (63°F). It's an ideal time for travelers to enjoy warm weather and outdoor activities while staying prepared for warmer days.

August Weather in Philadelphia: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Philadelphia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Philadelphia, August typically has an average temperature of 27°C (80°F), with highs reaching up to 37°C (98°F) and lows dropping to around 17°C (63°F).

Data source: Temperature data for Philadelphia generated using information from the Copernicus Climate Change Service.

August Precipitation in Philadelphia

In Philadelphia in August, the total precipitation amount is 130 mm (5.1 in) over the course of 14 days.

August Precipitation Trends in Philadelphia

The chart displays monthly precipitation patterns in Philadelphia, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Philadelphia, August typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 14 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

August Humidity in Philadelphia

In Philadelphia in August humidity is 77%. With an average temperature of 27°C (80°F), this humidity feels like walking through a warm, damp blanket that clings to your skin, making outdoor activities feel more strenuous and requiring frequent breaks and hydration for comfort.

August Average Humidity in Philadelphia

This chart illustrates the average monthly humidity levels in Philadelphia, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Philadelphia is approximately 77%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Philadelphia

In Philadelphia in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Philadelphia.

Maximum UV Index Levels in Philadelphia for August

The chart shows the monthly maximum UV Index (UVI) for Philadelphia in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Philadelphia typically reaches 11, which falls under the extreme exposure category.

Data source: Philadelphia August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How August Weather in Philadelphia Compares to Other Months

Weather in Philadelphia varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Philadelphia, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Philadelphia, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	110 mm (4.3 inches)	85%	moderate
February Weather	11°C (53°F)	173 mm (6.8 inches)	84%	high
March Weather	15°C (60°F)	121 mm (4.8 inches)	82%	very high
April Weather	18°C (64°F)	158 mm (6.2 inches)	82%	very high
May Weather	23°C (73°F)	129 mm (5.1 inches)	82%	extreme
June Weather	26°C (79°F)	168 mm (6.6 inches)	79%	extreme
July Weather	27°C (81°F)	107 mm (4.2 inches)	82%	extreme
August Weather	27°C (80°F)	130 mm (5.1 inches)	77%	extreme
September Weather	25°C (77°F)	93 mm (3.7 inches)	74%	very high
October Weather	20°C (68°F)	106 mm (4.2 inches)	73%	very high
November Weather	12°C (54°F)	68 mm (2.7 inches)	85%	high
December Weather	10°C (51°F)	121 mm (4.8 inches)	88%	moderate