July weather forecast
Sterling, VA

Weather in July

July in Sterling, Virginia, is a tropical summer month, with temperature in the range of an average high of 87.8°F (31°C) and an average low of 67.3°F (19.6°C).

Temperature

With an average high-temperature of 87.8°F (31°C) and an average low-temperature of 67.3°F (19.6°C), July is the warmest month.

Heat index

In July, the average heat index is calculated to be a torrid 99.7°F (37.6°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like pregnancy, differences in body mass, height, and shape, wind, 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 especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

The least humid month is July, with an average relative humidity of 70%.

Rainfall

In Sterling, Virginia, in July, it is raining for 16.3 days, with typically 3.03" (77mm) of accumulated precipitation. Throughout the year, in Sterling, Virginia, there are 158.1 rainfall days, and 31.46" (799mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in July in Sterling is 14h and 35min.
On the first day of the month, sunrise is at 5:47 am and sunset at 8:39 pm. On the last day of July, in Sterling, Virginia, sunrise is at 6:09 am and sunset at 8:22 pm EDT.

Sunshine

With an average of 10.7h of sunshine, July has the most sunshine of the year.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Sterling, Virginia. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In July, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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 bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the warmest month in Sterling?

July is the warmest month in Sterling, with an average high-temperature of 87.8°F (31°C) and an average low-temperature of 67.3°F (19.6°C).

What is the temperature in July in Sterling?

In July, in Sterling, the average high-temperature is 87.8°F (31°C), and the average low-temperature is 67.3°F (19.6°C). In July, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 99.7°F (37.6°C).

What is the least humid month in Sterling?

July is the least humid month, with an average relative humidity of 70%.

What is the average humidity in July in Sterling?

The average relative humidity in July in Sterling, Virginia, is 70%.

How many days does it rain in July in Sterling?

In Sterling, Virginia, in July, it is raining for 16.3 days, with typically 3.03" (77mm) of accumulated precipitation.

When it does not snow in Sterling?

May through October are months without snowfall in Sterling, Virginia.

What is the average length of the day in July in Sterling?

The average day length in July is 14h and 35min.

What time are sunrise and sunset in July in Sterling?

In July, on the first day of the month, sunrise is at 5:47 am and sunset at 8:39 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 8:22 pm EDT.

What month has the most sunshine in Sterling?

July has the most sunshine of the year in Sterling, with an average of 10.7h of sunshine.

How many hours of sunshine does Sterling have in July?

The average sunshine duration in July in Sterling is 10.7h.

What are the months with the highest UV index in Sterling?

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

How high is the UV index in July in Sterling?

The average daily maximum UV index in July in Sterling, Virginia, is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Sterling, VA

Average temperature in July - Sterling, VA
  • Average high temperature in July: 87.8°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 July: 67.3°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).

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Average pressure in July
Sterling, VA

Average pressure in July - Sterling, VA
  • Average pressure in July: 29.97"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 July
Sterling, VA

Average wind speed in July - Sterling, VA
  • Average wind speed in July: 4.8mph

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).

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Average humidity in July
Sterling, VA

Average humidity in July - Sterling, VA
  • Average humidity in July: 70%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (70%).

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Average rainfall in July
Sterling, VA

Average rainfall in July - Sterling, VA
  • Average rainfall in July: 3.03"

The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is September (1.93").

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Average rainfall days in July
Sterling, VA

Average rainfall days in July - Sterling, VA
  • Average rainfall days in July: 16.3 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).

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Average snowfall in July
Sterling, VA

Average snowfall in July - Sterling, VA
  • Average snowfall in July: 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").

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Average snowfall days in July
Sterling, VA

Average snowfall days in July - Sterling, VA
  • Average snowfall days in July: 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).

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Average daylight in July /
Average sunshine in July
Sterling, VA

Average daylight in July / Average sunshine in July - Sterling, VA
  • Average daylight in July: 14h and 35min

The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in July: 10h and 42min

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).

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Average sunshine days in July
Sterling, VA

Average sunshine days in July - Sterling, VA
  • Average sunshine days in July: 11.8 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).

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Average UV index in July
Sterling, VA

Average UV index in July - Sterling, VA
  • Average UV index in July: 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).

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Average cloud cover in July
Sterling, VA

Average cloud cover in July - Sterling, VA
  • Average cloud cover in July: 31

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in July
Sterling, VA

Average visibility in July - Sterling, VA
  • Average visibility in July: 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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