Allentown
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Allentown, PA

An aerial view of the vast city of Allentown in Pennsylvania, on a hot, sunny day, with the partly cloudy sky and a far view of a clear horizon line
An aerial view of the vast city of Allentown in Pennsylvania, on a hot, sunny day, with the partly cloudy sky and a far view of a clear horizon line
August, the last month of the summer, in Allentown, is another warm month, with average temperature fluctuating between 82.4°F (28°C) and 61°F (16.1°C).

Temperature

In August, the average high-temperature is essentially the same as in July - a still moderately hot 82.4°F (28°C). In Allentown, the average low-temperature is 61°F (16.1°C).

Heat index

In August, the average heat index is estimated at a hot 87.6°F (30.9°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, wind, clothing, 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 particularly important for children. 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

In August, the average relative humidity in Allentown is 71.9%.

Rainfall

In Allentown, in August, it is raining for 9.5 days, with typically 3.7" (93.7mm) of accumulated precipitation. Throughout the year, in Allentown, there are 126.8 rainfall days, and 45.4" (1151.9mm) of precipitation is accumulated.

Snowfall

Throughout the year, 32.9" (835.7mm) of snow is accumulated.

Daylight

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

Sunshine

The average sunshine in August is 8h.

UV index

In August, the average daily maximum UV index is 8. A UV Index value of 8 to 10 symbolizes a very high health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 8 in August transform into the following instructions:
Take special precautions, as unprotected skin can be damaged and can burn quickly. 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. 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.

What is the temperature in August in Allentown?

In Allentown, Pennsylvania, in August, the average high-temperature is 82.4°F (28°C), and the average low-temperature is 61°F (16.1°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that combines air temperature and relative humidity, in August is calculated to 87.6°F (30.9°C).

What is the average humidity in August in Allentown?

In August, the average relative humidity is 71.9%.

How many days does it rain in August in Allentown?

In Allentown, in August, during 9.5 rainfall days, 3.7" (93.7mm) of precipitation is typically accumulated.

How many hours of daylight does Allentown have in August?

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

How many hours of sunshine does Allentown have in August?

The average sunshine in August is 8h.

What is the UV index reading in August in Allentown?

In Allentown, the average daily maximum UV index in August is 8. A UV Index value of 8 to 10 symbolizes a very high hazard to health from the exposure to the Sun's UV radiation.
Average temperature in August - Allentown, PA
  • Average high temperature in August: 82.4°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in August: 60.9°F

The month with the highest average low temperature is July (62.7°F).
The coldest month (with the lowest average low temperature) is January (19.5°F).

Average humidity in August - Allentown, PA
  • Average humidity in August: 71.9%

The month with the highest relative humidity is September (74%).
The month with the lowest relative humidity is April (60.9%).

Average rainfall in August - Allentown, PA
  • Average rainfall in August: 3.7"

The wettest month (with the highest rainfall) is July (5").
The driest month (with the lowest rainfall) is February (2.7").

Average rainfall days in August - Allentown, PA
  • Average rainfall days in August: 9.5 days

Months with the highest number of rainy days are April and May (12.1 days).
Months with the lowest number of rainy days are September and October (9.1 days).

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

The month with the highest snowfall is February (11.1").
Months with the lowest snowfall are May, June, July, August, September and October (0").

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

The month with the highest number of snowfall days is January (5.6 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in August / Average sunshine in August - Allentown, PA
  • Average daylight in August: 13.7h

The month with the longest days is June (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in August: 8h

Months with most sunshine are June and July (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 4).

Average UV index in August - Allentown, PA
  • Average UV index in August: 8

Months with the highest UV index are June and July (UV index 9).
The month with the lowest UV index is December (UV index 1).