August weather forecastHerndon, WV
August
Weather in August
August, the last month of the summer in Herndon, is another warm month, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 58.5°F (14.7°C).Temperature
The transition from July to August brings an average high-temperature of a still moderately hot 82°F (27.8°C), barely different from July's 82.8°F (28.2°C). Herndon sees a consistent average low-temperature of 58.5°F (14.7°C) in August, indicating a substantial decrease from the day's temperature.Heat index
August's average heat index is calculated to be a hot 87.8°F (31°C). Continuous exposure and activity could induce a sense of tiredness and subsequently, heat cramps.When assessing, remember that heat index measurements are for light winds and shaded spots. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Humidity
June through August and November, with an average relative humidity of 77%, are the least humid months.Rainfall
In Herndon, in August, during 15.6 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. Throughout the year, there are 180.7 rainfall days, and 32.24" (819mm) of precipitation is accumulated.Snowfall
In Herndon, snow does not fall in June through September.Daylight
In Herndon, the average length of the day in August is 13h and 34min.On the first day of August, sunrise is at 6:30 am and sunset at 8:33 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 7:55 pm EDT.
Sunshine
The month with the most sunshine is August, with an average of 10.1h of sunshine.UV index
The months with the highest UV index are June and August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 6 during August translates into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Herndon, WV
- Average high temperature in August: 82°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in August: 58.5°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in August
Herndon, WV
- Average pressure in August: 30.03"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in August
Herndon, WV
- Average wind speed in August: 4.2mph
The windiest month (with the highest average wind speed) is January (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in August
Herndon, WV
- Average humidity in August: 77%
The month with the highest relative humidity is February (83%).
The months with the lowest relative humidity are June, July, August and November (77%).
Average rainfall in August
Herndon, WV
- Average rainfall in August: 2.13"
The wettest months (with the highest rainfall) are February and May (3.43").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in August
Herndon, WV
- Average rainfall days in August: 15.6 days
The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is November (11.3 days).
Average snowfall in August
Herndon, WV
- Average snowfall in August: 0"
The month with the highest snowfall is February (6.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Herndon, WV
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Herndon, WV
- Average daylight in August: 13h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in August: 10h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in August
Herndon, WV
- Average sunshine days in August: 12.8 days
The month with the most sunshine days is November (15.8 days).
The month with the least sunshine days is February (8.3 days).
Average UV index in August
Herndon, WV
- Average UV index in August: 6
The months with the highest UV index are June 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
Herndon, WV
- Average cloud cover in August: 36
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in August
Herndon, WV
- Average visibility in August: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
