August weather forecast
River Vale, NJ

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Weather in August

The last month of the summer, August, is another warm month in River Vale, New Jersey, with an average temperature ranging between min 67.3°F (19.6°C) and max 82.9°F (28.3°C).

Temperature

The average high-temperature in August, at a still moderately hot 82.9°F (28.3°C), reveals a modest deviation from July's 84.9°F (29.4°C). In River Vale, August nights witness a steady temperature drop to a comfortable 67.3°F (19.6°C).

Heat index

August's mean heat index is calculated to be a tropical 87.8°F (31°C). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.
Heat index determinations are made taking into account the shade and light air movements. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.

Humidity

August is the least humid month in River Vale, with an average relative humidity of 68%.

Rainfall

In River Vale, in August, it is raining for 14.4 days, with typically 2.28" (58mm) of accumulated precipitation. In River Vale, during the entire year, the rain falls for 153.9 days and collects up to 30.75" (781mm) of precipitation.

Snowfall

In River Vale, snow does not fall in May through October.

Daylight

In River Vale, the average length of the day in August is 13h and 46min.
On the first day of August, sunrise is at 5:52 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 7:29 pm EDT.

Sunshine

The average sunshine in August in River Vale is 10.2h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In August, a daily UV index of 6 turns into the following recommendations:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Experience reduced UV exposure by about half when donning a wide-brim hat.
Updated: Jul 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in August?

River Vale in August has an average high-temperature of 82.9°F (28.3°C) and an average low-temperature of 67.3°F (19.6°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is calculated to be 87.8°F (31°C).

What is the least humid month?

The least humid month is August, with an average relative humidity of 68%.

What is the average humidity in August?

In River Vale, the average relative humidity in August is 68%.

How much does it rain in August?

In August, the rain falls for 14.4 days. Throughout August, 2.28" (58mm) of precipitation is accumulated.

When it does not snow?

In River Vale, snow does not fall in May through October.

How many hours of daylight does River Vale have in August?

In River Vale, the average day length in August is 13h and 46min.

When are sunrise and sunset in August?

On the first day of August, sunrise is at 5:52 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 7:29 pm EDT.

How long on average sun shines in August?

The average sunshine duration in August is 10.2h.

What is the month with the highest UV index?

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

What is the UV index reading in August?

In August, the average daily maximum UV index in River Vale, New Jersey, is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
River Vale, NJ

Average temperature in August - River Vale, NJ
  • Average high temperature in August: 82.9°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in August: 67.3°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.1°F).

Average pressure in August
River Vale, NJ

Average pressure in August - River Vale, NJ
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in August
River Vale, NJ

Average wind speed in August - River Vale, NJ
  • Average wind speed in August: 5.8mph

The windiest months (with the highest average wind speed) are January and March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

Average humidity in August
River Vale, NJ

Average humidity in August - River Vale, NJ
  • Average humidity in August: 68%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (68%).

Average rainfall in August
River Vale, NJ

Average rainfall in August - River Vale, NJ
  • Average rainfall in August: 2.28"

The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days in August
River Vale, NJ

Average rainfall days in August - River Vale, NJ
  • Average rainfall days in August: 14.4 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (8.2 days).

Average snowfall in August
River Vale, NJ

Average snowfall in August - River Vale, NJ
  • Average snowfall in August: 0"

The month with the highest snowfall is March (3.07").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in August
River Vale, NJ

Average snowfall days in August - River Vale, NJ
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in August /
Average sunshine in August
River Vale, NJ

Average daylight in August / Average sunshine in August - River Vale, NJ
  • Average daylight in August: 13h and 5min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in August: 10h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in August
River Vale, NJ

Average sunshine days in August - River Vale, NJ
  • Average sunshine days in August: 15 days

The months with the most sunshine days are January and November (18.1 days).
The months with the least sunshine days are April and June (12.7 days).

Average UV index in August
River Vale, NJ

Average UV index in August - River Vale, NJ
  • Average UV index in August: 6

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

Average cloud cover in August
River Vale, NJ

Average cloud cover in August - River Vale, NJ
  • Average cloud cover in August: 32

The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).

Average visibility in August
River Vale, NJ

Average visibility in August - River Vale, NJ
  • 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).

River Vale, New Jersey, USA

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