Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
As Herndon steps into August, the average high-temperature is measured at a still warm 80.2°F (26.8°C), displaying minor differences from July's 82.4°F (28°C). Herndon experiences a nighttime temperature average of 59.2°F (15.1°C) during August.Humidity
In Herndon, the average relative humidity in August is 79%.Rainfall
In Herndon, Pennsylvania, in August, during 15.6 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. Throughout the year, there are 165.3 rainfall days, and 30.55" (776mm) of precipitation is accumulated.Snowfall
In Herndon, snow does not fall in June through September.Daylight
The average length of the day in August in Herndon is 13h and 44min.On the first day of August, sunrise is at 6:04 am and sunset at 8:22 pm. On the last day of the month, sunrise is at 6:34 am and sunset at 7:40 pm EDT.
Sunshine
The average sunshine in August is 10.1h.UV index
In Herndon, Pennsylvania, the average daily maximum UV index in August is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average UV index of 5 in August transforms into this advice:
Undertake protective steps - Recommendations to avoid sunburn are issued. It's recommended to limit sun exposure when its radiation is at its peak during midday. 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.
Frequently asked questions
What is the usual temperature for Herndon in August?
What is the average humidity in August in Herndon?
How many days does it rain in August in Herndon?
When it does not snow in Herndon?
What is the average length of the day in August in Herndon?
When is the sunrise / sunset in August in Herndon?
How many hours of sunshine does Herndon have in August?
How high is the UV index in August in Herndon?
Average temperature in August
Herndon, PA
- Average high temperature in August: 80.2°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in August: 59.2°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in August
Herndon, PA
- Average pressure in August: 30"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in August
Herndon, PA
- Average wind speed in August: 4.5mph
The windiest months (with the highest average wind speed) are March and April (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in August
Herndon, PA
- Average humidity in August: 79%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in August
Herndon, PA
- Average rainfall in August: 2.6"
The wettest month (with the highest rainfall) is May (3.35").
The driest months (with the least rainfall) are February and November (2.09").
Average rainfall days in August
Herndon, PA
- Average rainfall days in August: 15.6 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (9 days).
Average snowfall in August
Herndon, PA
- Average snowfall in August: 0"
The month with the highest snowfall is February (5.67").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Herndon, PA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (11.3 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, PA
- Average daylight in August: 13h and 4min
The month with the longest days is June (Average daylight: 15h and 0min).
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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in August
Herndon, PA
- Average sunshine days in August: 13.5 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is May (9.9 days).
Average UV index in August
Herndon, PA
- Average UV index in August: 5
The months with the highest UV index are June and July (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
Herndon, PA
- Average cloud cover in August: 33
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in August
Herndon, PA
- Average visibility in August: 5mi
The months with the highest visibility are March, April, June, July and November (6mi).
The months with the lowest visibility are January, February, May, August, September, October and December (5mi).
Herndon, Pennsylvania, USA
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