August weather forecast
Manassas, VA

Weather in August

August, the last month of the summer, in Manassas, is another warm month, with temperature in the range of an average high of 85.8°F (29.9°C) and an average low of 65.8°F (18.8°C).

Temperature

In Manassas, the average high-temperature is relatively the same as in July - a moderately hot 85.8°F (29.9°C). The average low-temperature, in Manassas, is 65.8°F (18.8°C).

Heat index

The average heat index is estimated at a torrid 96.4°F (35.8°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', 'felt air temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, pregnancy, differences in body mass, height, and shape). 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 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Manassas, the average relative humidity in August is 74%.

Rainfall

August is the month with the most rainfall in Manassas. Rain falls for 16.3 days and accumulates 3.43" (87mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Manassas, the average length of the day is 13.6h.

Sunshine

In Manassas, the average sunshine is 10.1h.

UV index

Months with the highest UV index in Manassas are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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.
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FAQ

What is the temperature in August in Manassas?

In Manassas, Virginia, in August, the average high-temperature is 85.8°F (29.9°C), and the average low-temperature is 65.8°F (18.8°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in August is estimated at 96.4°F (35.8°C).

What is the average humidity in August in Manassas?

In Manassas, the average relative humidity in August is 74%.

What is the rainiest month in Manassas?

The month with the most rainfall in Manassas is August when the rain falls for 16.3 days and typically aggregates up to 3.43" (87mm) of precipitation.

How many days does it rain in August in Manassas?

In August, in Manassas, Virginia, the rain falls for 16.3 days. Throughout August, 3.43" (87mm) of precipitation is accumulated.

When it does not snow in Manassas?

In Manassas snow does not fall in May through October.

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

In Manassas, Virginia, the average length of the day in August is 13.6h.

How many hours of sunshine does Manassas have in August?

In August, the average sunshine in Manassas, Virginia, is 10.1h.

What is the month with the highest UV index in Manassas?

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

What is the UV index reading in August in Manassas?

The average daily maximum UV index in August in Manassas, Virginia, is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV rays.

Average temperature in August
Manassas, VA

Average temperature in August - Manassas, VA
  • Average high temperature in August: 29.9°C

The warmest month (with the highest average high temperature) is July (31.3°C).
The month with the lowest average high temperature is January (4.8°C).

  • Average low temperature in August: 18.8°C

The month with the highest average low temperature is July (19.5°C).
The coldest month (with the lowest average low temperature) is January (-3.1°C).

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Average pressure in August
Manassas, VA

Average pressure in August - Manassas, VA
  • Average pressure in August: 1015.7mbar

The month with the highest atmospheric pressure is November (1020.7mbar).
The month with the lowest atmospheric pressure is June (1014.2mbar).

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Average wind speed in August
Manassas, VA

Average wind speed in August - Manassas, VA
  • Average wind speed in August: 7.4km/h

The windiest months (with the highest average wind speed) are March and April (11.2km/h).
The calmest month (with the lowest average wind speed) is August (7.4km/h).

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Average humidity in August
Manassas, VA

Average humidity in August - Manassas, VA
  • Average humidity in August: 74%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).

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Average rainfall in August
Manassas, VA

Average rainfall in August - Manassas, VA
  • Average rainfall in August: 87mm

The wettest month (with the highest rainfall) is August (87mm).
The driest month (with the least rainfall) is September (49mm).

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Average rainfall days in August
Manassas, VA

Average rainfall days in August - Manassas, VA
  • Average rainfall days in August: 16.3 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is November (9.3 days).

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Average snowfall in August
Manassas, VA

Average snowfall in August - Manassas, VA
  • Average snowfall in August: 0mm

The month with the highest snowfall is January (94mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in August
Manassas, VA

Average snowfall days in August - Manassas, VA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (5.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in August /
Average sunshine in August
Manassas, VA

Average daylight in August / Average sunshine in August - Manassas, VA
  • Average daylight in August: 13.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in August: 10.1h

The month with the most sunshine is July (Average sunshine: 10.7h).
Months with the least sunshine are January, February and December (Average sunshine: 5.2).

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Average sunshine days in August
Manassas, VA

Average sunshine days in August - Manassas, VA
  • Average sunshine days in August: 13 days

The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.7 days).

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Average UV index in August
Manassas, VA

Average UV index in August - Manassas, VA
  • Average UV index in August: 6

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

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Average cloud cover in August
Manassas, VA

Average cloud cover in August - Manassas, VA
  • Average cloud cover in August: 34

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

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Average visibility in August
Manassas, VA

Average visibility in August - Manassas, VA
  • Average visibility in August: 9km

Months with the highest visibility are January, February, March, April, June, July, August and November (9km).
Months with the lowest visibility are May, September, October and December (8km).

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