August weather forecast and climate
Summit, NJ

The last month of the summer, August, is also a moderately hot month in Summit, New Jersey, with average temperature ranging between max 81.9°F (27.7°C) and min 64.2°F (17.9°C).

Temperature

In Summit, the average high-temperature in August is almost the same as in July - a still moderately hot 81.9°F (27.7°C). In Summit, the average low-temperature is 64.2°F (17.9°C).

Heat index

The average heat index is appraised at a hot 87.1°F (30.6°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, pregnancy, clothing). 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. 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.

Humidity

April and August, with an average relative humidity of 74%, are the least humid months.

Rainfall

In Summit, during August, the rain falls for 16.3 days and regularly aggregates up to 2.72" (69mm) of precipitation. Throughout the year, there are 164.2 rainfall days, and 30.67" (779mm) of precipitation is accumulated.

Snowfall

In Summit snow does not fall in June through September.

Daylight

In Summit, New Jersey, the average length of the day is 13.7h.

Sunshine

In Summit, New Jersey, the average sunshine is 10.1h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in August in Summit?

The average high-temperature, in August, in Summit, New Jersey, is 81.9°F (27.7°C), while the average low-temperature is 64.2°F (17.9°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), that represents influence of the relative humidity to air temperaure, is appraised at 87.1°F (30.6°C).

What is the least humid month in Summit?

April and August, with an average relative humidity of 74%, are the least humid months in Summit, New Jersey.

What is the average humidity in August in Summit?

The average relative humidity in August in Summit, New Jersey, is 74%.

How much does it rain in Summit in August?

In Summit, in August, during 16.3 rainfall days, 2.72" (69mm) of precipitation is typically accumulated.

When it does not snow in Summit?

June through September are months without snowfall in Summit.

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

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

How many hours of sunshine does Summit have in August?

In Summit, New Jersey, the average sunshine in August is 10.1h.

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

June through August, with an average maximum UV index of 6, are months with the highest UV index.

How high is the UV index in August in Summit?

The average daily maximum UV index in August in Summit, New Jersey, is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV radiation.
Average temperature in August - Summit, NJ
  • Average high temperature in August: 81.9°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in August: 64.2°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in August - Summit, NJ
  • Average pressure in August: 29.99"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

Average wind speed in August - Summit, NJ
  • Average wind speed in August: 5.3mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in August - Summit, NJ
  • Average humidity in August: 74%

Months with the highest relative humidity are February and December (80%).
Months with the lowest relative humidity are April and August (74%).

Average rainfall in August - Summit, NJ
  • Average rainfall in August: 2.72"

The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is September (1.69").

Average rainfall days in August - Summit, NJ
  • Average rainfall days in August: 16.3 days

The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is January (8.8 days).

Average snowfall in August - Summit, NJ
  • Average snowfall in August: 0"

The month with the highest snowfall is March (3.5").
Months with the least snowfall are June, July, August and September (0").

Average snowfall days in August - Summit, NJ
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (7.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in August / Average sunshine in August - Summit, NJ
  • Average daylight in August: 13.7h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in August: 10.1h

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average sunshine days in August - Summit, NJ
  • Average sunshine days in August: 12.5 days

The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in August - Summit, NJ
  • Average UV index in August: 6

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

Average cloud cover in August - Summit, NJ
  • Average cloud cover in August: 34

Months with the most cloud cover are February and March (Cloud cover 49).
Months with the least cloud cover are July and August (Cloud cover 34).

Average visibility in August - Summit, NJ
  • Average visibility in August: 6mi

Months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).