July weather forecast
Manassas, VA

Weather in July

July is a tropical summer month in Manassas, Virginia, with average temperature ranging between max 88.3°F (31.3°C) and min 67.1°F (19.5°C).

Temperature

With an average high-temperature of 88.3°F (31.3°C) and an average low-temperature of 67.1°F (19.5°C), July is the warmest month.

Heat index

In July, the average heat index is estimated at a torrid 102.4°F (39.1°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. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like wind, metabolic differences, differences in body mass, height, and shape, 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 particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

July is the least humid month, with an average relative humidity of 72%.

Rainfall

In Manassas, during July, the rain falls for 15.8 days and regularly aggregates up to 2.68" (68mm) of precipitation. In Manassas, Virginia, during the entire year, the rain falls for 157.5 days and collects up to 30.35" (771mm) of precipitation.

Snowfall

May through October are months without snowfall in Manassas.

Daylight

In July, the average length of the day in Manassas is 14.6h.

Sunshine

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

UV index

Months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
[Resources]

FAQ

What is the warmest month in Manassas?

With an average high-temperature of 88.3°F (31.3°C) and an average low-temperature of 67.1°F (19.5°C), July is the warmest month in Manassas.

What is the temperature in July in Manassas?

The average high-temperature, in July, in Manassas, Virginia, is 88.3°F (31.3°C), while the average low-temperature is 67.1°F (19.5°C). In July, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is estimated at 102.4°F (39.1°C).

What is the least humid month in Manassas?

The least humid month is July, with an average relative humidity of 72%.

What is the average humidity in July in Manassas?

In Manassas, Virginia, the average relative humidity in July is 72%.

How much does it rain in Manassas in July?

In Manassas, in July, during 15.8 rainfall days, 2.68" (68mm) of precipitation is typically accumulated.

When it does not snow in Manassas?

May through October are months without snowfall in Manassas.

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

In Manassas, the average length of the day in July is 14.6h.

What month has the most sunshine in Manassas?

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

How long on average sun shines in July in Manassas?

The average sunshine in July in Manassas, Virginia, is 10.7h.

When is the highest UV index in Manassas?

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

What is the UV index reading in July in Manassas?

In July, the average daily maximum UV index in Manassas, Virginia, is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to the UV radiation.

Average temperature in July
Manassas, VA

Average temperature in July - Manassas, VA
  • Average high temperature in July: 31.3°C

The warmest month (with the highest average high temperature) is July (31.3°C).
The month with the lowest average high temperature is January (4.8°C).

  • Average low temperature in July: 19.5°C

The month with the highest average low temperature is July (19.5°C).
The coldest month (with the lowest average low temperature) is January (-3.1°C).

[Resources]

Average pressure in July
Manassas, VA

Average pressure in July - Manassas, VA
  • Average pressure in July: 1015mbar

The month with the highest atmospheric pressure is November (1020.7mbar).
The month with the lowest atmospheric pressure is June (1014.2mbar).

[Resources]

Average wind speed in July
Manassas, VA

Average wind speed in July - Manassas, VA
  • Average wind speed in July: 7.5km/h

The windiest months (with the highest average wind speed) are March and April (11.2km/h).
The calmest month (with the lowest average wind speed) is August (7.4km/h).

[Resources]

Average humidity in July
Manassas, VA

Average humidity in July - Manassas, VA
  • Average humidity in July: 72%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).

[Resources]

Average rainfall in July
Manassas, VA

Average rainfall in July - Manassas, VA
  • Average rainfall in July: 68mm

The wettest month (with the highest rainfall) is August (87mm).
The driest month (with the least rainfall) is September (49mm).

[Resources]

Average rainfall days in July
Manassas, VA

Average rainfall days in July - Manassas, VA
  • Average rainfall days in July: 15.8 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is November (9.3 days).

[Resources]

Average snowfall in July
Manassas, VA

Average snowfall in July - Manassas, VA
  • Average snowfall in July: 0mm

The month with the highest snowfall is January (94mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

[Resources]

Average snowfall days in July
Manassas, VA

Average snowfall days in July - Manassas, VA
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is February (5.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

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

Average daylight in July / Average sunshine in July - Manassas, VA
  • Average daylight in July: 14.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in July: 10.7h

The month with the most sunshine is July (Average sunshine: 10.7h).
Months with the least sunshine are January, February and December (Average sunshine: 5.2).

[Resources]

Average sunshine days in July
Manassas, VA

Average sunshine days in July - Manassas, VA
  • Average sunshine days in July: 12.2 days

The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.7 days).

[Resources]

Average UV index in July
Manassas, VA

Average UV index in July - Manassas, VA
  • Average UV index in July: 6

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

[Resources]

Average cloud cover in July
Manassas, VA

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

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

[Resources]

Average visibility in July
Manassas, VA

Average visibility in July - Manassas, VA
  • Average visibility in July: 9km

Months with the highest visibility are January, February, March, April, June, July, August and November (9km).
Months with the lowest visibility are May, September, October and December (8km).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location