August weather forecast
Alexandria, VA

Weather in August

The last month of the summer, August, is also a moderately hot month in Alexandria, Virginia, with an average temperature varying between 67.6°F (19.8°C) and 85.6°F (29.8°C).

Temperature

In Alexandria, the average high-temperature in August is essentially the same as in July - a warm 85.6°F (29.8°C). In August, in Alexandria, Virginia, the average low-temperature is 67.6°F (19.8°C).

Heat index

In August, the average heat index is evaluated at a sweltering 95°F (35°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With 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 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like metabolic differences, wind, clothing, and activity influence one's weather impression. 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In August, the average relative humidity is 72%.

Rainfall

August is the month with the most rainfall in Alexandria. Rain falls for 15.9 days and accumulates 3.43" (87mm) of precipitation.

Snowfall

May through October are months without snowfall.

Ocean temperature

With an average ocean temperature of 78.1°F (25.6°C), August is the month with the warmest seawater in Alexandria.
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In August, the average length of the day is 13h and 38min.
On the first day of the month, sunrise is at 6:09 am and sunset at 8:19 pm. On the last day of August, sunrise is at 6:36 am and sunset at 7:40 pm EDT.

Sunshine

In August, the average sunshine is 10.2h.

UV index

The months with the highest UV index in Alexandria, Virginia, are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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 the 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in August in Alexandria?

The average high-temperature, in August, in Alexandria, Virginia, is 85.6°F (29.8°C), while the average low-temperature is 67.6°F (19.8°C). in August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 95°F (35°C).

What is the average humidity in August in Alexandria?

The average relative humidity in August in Alexandria is 72%.

What is the wettest month in Alexandria?

The month with the most rainfall is August, when the rain falls for 15.9 days and typically aggregates up to 3.43" (87mm) of precipitation.

How much does it rain in Alexandria in August?

In Alexandria, during August, the rain falls for 15.9 days and regularly aggregates up to 3.43" (87mm) of precipitation.

When it does not snow in Alexandria?

In Alexandria, snow does not fall in May through October.

What month is the ocean warmest in Alexandria?

The month with the warmest seawater in Alexandria is August, with an average ocean temperature of 78.1°F (25.6°C).

What is the ocean temperature in August in Alexandria?

In Alexandria, the average seawater temperature in August is 78.1°F (25.6°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Alexandria have in August?

In Alexandria, the average day length in August is 13h and 38min.

What time are sunrise and sunset in August in Alexandria?

On the first day of August in Alexandria, sunrise is at 6:09 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 7:40 pm EDT.

How many hours of sunshine does Alexandria have in August?

In Alexandria, the average sunshine duration in August is 10.2h.

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

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

What is the UV index reading in August in Alexandria?

In Alexandria, Virginia, the average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Alexandria, VA

Average temperature in August - Alexandria, VA
  • Average high temperature in August: 85.6°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in August: 67.6°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

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Average pressure in August
Alexandria, VA

Average pressure in August - Alexandria, VA
  • Average pressure in August: 29.99"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in August
Alexandria, VA

Average wind speed in August - Alexandria, VA
  • Average wind speed in August: 5mph

The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in August
Alexandria, VA

Average humidity in August - Alexandria, VA
  • Average humidity in August: 72%

The months with the highest relative humidity are May, October and December (76%).
The months with the lowest relative humidity are April and July (71%).

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Average rainfall in August
Alexandria, VA

Average rainfall in August - Alexandria, VA
  • Average rainfall in August: 3.43"

The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is September (1.93").

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Average rainfall days in August
Alexandria, VA

Average rainfall days in August - Alexandria, VA
  • Average rainfall days in August: 15.9 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (8.5 days).

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Average snowfall in August
Alexandria, VA

Average snowfall in August - Alexandria, VA
  • Average snowfall in August: 0"

The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in August
Alexandria, VA

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

The month with the highest number of snowfall days is January (4.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in August
Alexandria, VA

Average sea temperature in August - Alexandria, VA
  • Average sea temperature in August: 78°F

The best month for swimming (with the highest average sea temperature) is August (78°F).
The coldest month (with the lowest average sea temperature) is February (45.2°F).

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

Average daylight in August / Average sunshine in August - Alexandria, VA
  • Average daylight in August: 13h and 38min

The month with the longest days is June (Average daylight: 14h and 50min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in August: 10h and 12min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

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Average sunshine days in August
Alexandria, VA

Average sunshine days in August - Alexandria, VA
  • Average sunshine days in August: 13.7 days

The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.5 days).

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Average UV index in August
Alexandria, VA

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

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

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Average cloud cover in August
Alexandria, VA

Average cloud cover in August - Alexandria, VA
  • Average cloud cover in August: 32

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in August
Alexandria, VA

Average visibility in August - Alexandria, VA
  • Average visibility in August: 6mi

The 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).

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