July weather forecast
Centreville, VA

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Weather in July

July in Centreville, Virginia, is a hot summer month, with an average temperature varying between 68.4°F (20.2°C) and 88°F (31.1°C).

Temperature

July stands out as Centreville's warmest month, with an average high-temperature of 88°F (31.1°C) and a low-temperature of 68.4°F (20.2°C).

Heat index

July's heat index is estimated at a fiery hot 100.4°F (38°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', shows a temperature sensation when both heat and moisture conditions are combined. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

July is the least humid month, with an average relative humidity of 71%.

Rainfall

In July, the rain falls for 17 days. Throughout July, 3.03" (77mm) of precipitation is accumulated. Throughout the year, there are 162 rainfall days, and 31.65" (804mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

In July, the average length of the day is 14h and 34min.
On the first day of the month, sunrise is at 5:48 am and sunset at 8:38 pm. On the last day of July, sunrise is at 6:10 am and sunset at 8:21 pm EDT.

Sunshine

The month with the most sunshine is July, with an average of 10.8h of sunshine.

UV index

The 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 exposure to the Sun's UV radiation for the ordinary person.
Note: In July, the maximum UV index of 6 suggests these recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Updated: Jun 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the warmest month?

Centreville registers the average highest temperatures during July, with peaks of 88°F (31.1°C) and lows of 68.4°F (20.2°C).

Is it hot during July?

In Centreville, 88°F (31.1°C) is the average high-temperature and 68.4°F (20.2°C) is the average low-temperature during July. In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 100.4°F (38°C).

What is the least humid month?

With an average relative humidity of 71%, July is the least humid month in Centreville.

What is the average humidity in July?

In Centreville, the average relative humidity in July is 71%.

How much does it rain in Centreville in July?

In Centreville, Virginia, in July, during 17 rainfall days, 3.03" (77mm) of precipitation is typically accumulated.

When it does not snow?

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

What is the average length of the day in July?

In Centreville, the average day length in July is 14h and 34min.

When are sunrise and sunset in July?

In July, on the first day of the month, sunrise is at 5:48 am and sunset at 8:38 pm. On the last day of the month, sunrise is at 6:10 am and sunset at 8:21 pm EDT.

What month has the most sunshine?

The month with the most sunshine is July, with an average of 10.8h of sunshine.

How long on average sun shines in July?

In July, the average sunshine duration in Centreville is 10.8h.

When is the highest UV index?

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

What is the UV index reading in July?

In July, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Centreville, VA

Average temperature in July - Centreville, VA
  • Average high temperature in July: 88°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.5°F).

  • Average low temperature in July: 68.4°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

Average pressure in July
Centreville, VA

Average pressure in July - Centreville, 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).

Average wind speed in July
Centreville, VA

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

The windiest month (with the highest average wind speed) is March (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in July
Centreville, VA

Average humidity in July - Centreville, VA
  • Average humidity in July: 71%

The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (71%).

Average rainfall in July
Centreville, VA

Average rainfall in July - Centreville, 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 (2.01").

Average rainfall days in July
Centreville, VA

Average rainfall days in July - Centreville, VA
  • Average rainfall days in July: 17 days

The months with the highest number of rainy days are May and August (17.3 days).
The month with the least rainy days is November (9.1 days).

Average snowfall in July
Centreville, VA

Average snowfall in July - Centreville, 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").

Average snowfall days in July
Centreville, VA

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

The month with the highest number of snowfall days is January (5.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in July / Average sunshine in July - Centreville, VA
  • Average daylight in July: 14h and 4min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in July: 10h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 12min).

Average sunshine days in July
Centreville, VA

Average sunshine days in July - Centreville, VA
  • Average sunshine days in July: 11.3 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.3 days).

Average UV index in July
Centreville, VA

Average UV index in July - Centreville, 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).

Average cloud cover in July
Centreville, VA

Average cloud cover in July - Centreville, VA
  • Average cloud cover in July: 30

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in July
Centreville, VA

Average visibility in July - Centreville, 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).

Centreville, Virginia, USA

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