June weather forecastHerndon, VA
June
Weather in June
June marks the onset of summer in Herndon, which translates into warm sunshine-filled days. Though the temperatures rise, the weather is far from sweltering, with averages peaking at 82.8°F (28.2°C) for a high and 62.4°F (16.9°C) for a low. A noticeable feature of this month is the extended daylight hours, giving plenty of time to enjoy outdoor activities. Herndon's landscapes look exceptionally picturesque under the bright summer sun. June is a particularly pleasant time to visit Herndon, bearing witness to the city in full summer bloom.Temperature
A minor escalation in the average high-temperature is seen with the onset of June, moving from a warm 75°F (23.9°C) in May to a still moderately hot 82.8°F (28.2°C). Throughout June, an average low-temperature of 62.4°F (16.9°C) is expected.Heat index
The heat index value for June is computed to be a hot 87.8°F (31°C). If one continues to be active during enduring exposure, it could result in fatigue and heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Humidity
The average relative humidity in June is 72%.Rainfall
In June, the rain falls for 14.8 days. Throughout June, 2.48" (63mm) of precipitation is accumulated. Throughout the year, there are 158.1 rainfall days, and 31.46" (799mm) of precipitation is accumulated.Snowfall
In Herndon, snow does not fall in May through October.Daylight
June has the longest days of the year, with an average of 14h and 54min of daylight.On the first day of June, sunrise is at 5:45 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:47 am and sunset at 8:39 pm EDT.
Sunshine
In June, the average sunshine is 10.1h.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 6 during June leads to these advisories:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in June
Herndon, VA
- Average high temperature in June: 82.8°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 (39.7°F).
- Average low temperature in June: 62.4°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).
Average pressure in June
Herndon, VA
- Average pressure in June: 29.95"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 June
Herndon, VA
- Average wind speed in June: 5.5mph
The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in June
Herndon, VA
- Average humidity in June: 72%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (70%).
Average rainfall in June
Herndon, VA
- Average rainfall in June: 2.48"
The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in June
Herndon, VA
- Average rainfall days in June: 14.8 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (9.3 days).
Average snowfall in June
Herndon, VA
- Average snowfall in June: 0"
The month with the highest snowfall is January (3.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in June
Herndon, VA
- Average snowfall days in June: 0 days
The months with the highest number of snowfall days are January and February (5.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in June /
Average sunshine in June
Herndon, VA
- Average daylight in June: 14h and 54min
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 June: 10h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 0min).
Average sunshine days in June
Herndon, VA
- Average sunshine days in June: 13.6 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in June
Herndon, VA
- Average UV index in June: 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 June
Herndon, VA
- Average cloud cover in June: 34
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in June
Herndon, VA
- Average visibility in June: 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).
