August weather forecast
Saint Louis, VA

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Weather in August

The last month of the summer, August, is another warm month in Saint Louis, Virginia, with temperature in the range of an average low of 64°F (17.8°C) and an average high of 84.6°F (29.2°C).

Temperature

Saint Louis's August average high-temperature settles at a warm 84.6°F (29.2°C), showing a near match with the preceding month. Nighttime temperature lowers to an average of 64°F (17.8°C) in August.

Heat index

For most parts of August, the heat index is computed to be a tropical 93.2°F (34°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', embodies the combination of air temperature and moisture content to illustrate perceived heat. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.

Humidity

In August, the average relative humidity is 75%.

Rainfall

The wettest months are May and August, with an average 3.35" (85mm) of rainfall.

Snowfall

In Saint Louis, snow does not fall in May through September.

Daylight

The average length of the day in August in Saint Louis is 13h and 39min.
On the first day of August, sunrise is at 6:12 am and sunset at 8:22 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:42 pm EDT.

Sunshine

The average sunshine in August is 10.3h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Saint Louis. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index, 6 in August, converts into the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Updated: Jul 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot during August?

An average high-temperature, in August, in Saint Louis, is 84.6°F (29.2°C) and the average low-temperature is 64°F (17.8°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is computed to be 93.2°F (34°C).

What is the average humidity in August?

The average relative humidity in August is 75%.

What is the rainiest month?

The wettest months are May and August, with an average 3.35" (85mm) of rainfall.

How much does it rain in August?

In Saint Louis, in August, during 16.7 rainfall days, 3.35" (85mm) of precipitation is typically accumulated.

When it does not snow?

In Saint Louis, Virginia, snow does not fall in May through September.

What is the average length of the day in August?

In Saint Louis, the average day length in August is 13h and 39min.

What time are sunrise and sunset in August?

On the first day of August, sunrise is at 6:12 am and sunset at 8:22 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:42 pm EDT.

How long on average sun shines in August?

The average sunshine duration in August in Saint Louis is 10.3h.

What is the month with the highest UV index?

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

What is the UV index intensity in August?

The average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability 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
Saint Louis, VA

Average temperature in August - Saint Louis, VA
  • Average high temperature in August: 84.6°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in August: 64°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in August
Saint Louis, VA

Average pressure in August - Saint Louis, VA
  • Average pressure in August: 30"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).

Average wind speed in August
Saint Louis, VA

Average wind speed in August - Saint Louis, VA
  • Average wind speed in August: 4.4mph

The windiest month (with the highest average wind speed) is March (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).

Average humidity in August
Saint Louis, VA

Average humidity in August - Saint Louis, VA
  • Average humidity in August: 75%

The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (73%).

Average rainfall in August
Saint Louis, VA

Average rainfall in August - Saint Louis, VA
  • Average rainfall in August: 3.35"

The wettest months (with the highest rainfall) are May and August (3.35").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in August
Saint Louis, VA

Average rainfall days in August - Saint Louis, VA
  • Average rainfall days in August: 16.7 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (10.1 days).

Average snowfall in August
Saint Louis, VA

Average snowfall in August - Saint Louis, VA
  • Average snowfall in August: 0"

The month with the highest snowfall is January (4.17").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in August
Saint Louis, VA

Average snowfall days in August - Saint Louis, VA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in August /
Average sunshine in August
Saint Louis, VA

Average daylight in August / Average sunshine in August - Saint Louis, VA
  • Average daylight in August: 13h and 4min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in August: 10h and 2min

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

Average sunshine days in August
Saint Louis, VA

Average sunshine days in August - Saint Louis, VA
  • Average sunshine days in August: 12.2 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (11.1 days).

Average UV index in August
Saint Louis, VA

Average UV index in August - Saint Louis, 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, February, November and December (UV index 2).

Average cloud cover in August
Saint Louis, VA

Average cloud cover in August - Saint Louis, VA
  • Average cloud cover in August: 33

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in August
Saint Louis, VA

Average visibility in August - Saint Louis, VA
  • Average visibility in August: 6mi

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

Saint Louis, Virginia, USA

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