July weather forecast and climate
Washington, DC

Rows of jacaranda trees in spring in the tidal basin of the Washington Monument in Washington city, DC, USA
Rows of jacaranda trees in spring in the tidal basin of the Washington Monument in Washington city, DC, USA

Weather in July

July is a tropical summer month in Washington, District of Columbia, with average temperature ranging between min 69.1°F (20.6°C) and max 88°F (31.1°C).

Temperature

With an average high-temperature of 88°F (31.1°C) and an average low-temperature of 69.1°F (20.6°C), July is the warmest month.

Heat index

In July, the average heat index is calculated to a sweltering 100.8°F (38.2°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', 'apparent temperature', 'real feel', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, pregnancy, differences in body mass, height, and shape), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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 normally cools itself by perspiration, as evaporated sweat carries heat away from the body. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

April and July, with an average relative humidity of 71%, are the least humid months.

Rainfall

In Washington, during July, the rain falls for 16.4 days and regularly aggregates up to 2.76" (70mm) of precipitation. In Washington, during the entire year, the rain falls for 149.1 days and collects up to 26.14" (664mm) of precipitation.

Snowfall

In Washington snow does not fall in April through November.

Daylight

The average length of the day in Washington is 14.6h.

Sunshine

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

UV index

The average daily maximum UV index in Washington, District of Columbia, is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the warmest month in Washington?

With an average high-temperature of 88°F (31.1°C) and an average low-temperature of 69.1°F (20.6°C), July is the warmest month in Washington, District of Columbia.

What is the temperature in July in Washington?

In Washington, District of Columbia, in July, the average high-temperature is 88°F (31.1°C), and the average low-temperature is 69.1°F (20.6°C). In July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), that combines both air temperature and relative humidity, is estimated at 100.8°F (38.2°C).

What are the least humid months in Washington?

Months with the lowest humidity are April and July, with an average relative humidity of 71%.

What is the average humidity in July in Washington?

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

How much does it rain in Washington in July?

In Washington, in July, during 16.4 rainfall days, 2.76" (70mm) of precipitation is typically accumulated.

When it does not snow in Washington?

April through November are months without snowfall in Washington.

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

The average length of the day in July in Washington, District of Columbia, is 14.6h.

What month has the most sunshine in Washington?

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

How many hours of sunshine does Washington have in July?

In July, the average sunshine in Washington, District of Columbia, is 10.7h.

What is the UV index intensity in July in Washington?

In Washington, the average daily maximum UV index in July is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV rays.

Average temperature in July
Washington, DC

Average temperature in July - Washington, DC
  • Average high temperature in July: 31.1°C

The warmest month (with the highest average high temperature) is July (31.1°C).
The month with the lowest average high temperature is January (4.8°C).

  • Average low temperature in July: 20.6°C

The month with the highest average low temperature is July (20.6°C).
The coldest month (with the lowest average low temperature) is January (-2.5°C).

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Average pressure in July
Washington, DC

Average pressure in July - Washington, DC
  • Average pressure in July: 1014.9mbar

The month with the highest atmospheric pressure is November (1020.6mbar).
The month with the lowest atmospheric pressure is June (1014.1mbar).

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Average wind speed in July
Washington, DC

Average wind speed in July - Washington, DC
  • Average wind speed in July: 8.2km/h

The windiest month (with the highest average wind speed) is March (12.7km/h).
The calmest month (with the lowest average wind speed) is August (8.1km/h).

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Average humidity in July
Washington, DC

Average humidity in July - Washington, DC
  • Average humidity in July: 71%

The month with the highest relative humidity is May (76%).
Months with the lowest relative humidity are April and July (71%).

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Average rainfall in July
Washington, DC

Average rainfall in July - Washington, DC
  • Average rainfall in July: 70mm

The wettest month (with the highest rainfall) is August (88mm).
The driest month (with the least rainfall) is January (40mm).

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Average rainfall days in July
Washington, DC

Average rainfall days in July - Washington, DC
  • Average rainfall days in July: 16.4 days

The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is November (8.1 days).

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Average snowfall in July
Washington, DC

Average snowfall in July - Washington, DC
  • Average snowfall in July: 0mm

The month with the highest snowfall is January (55mm).
Months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

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Average snowfall days in July
Washington, DC

Average snowfall days in July - Washington, DC
  • Average snowfall days in July: 0 days

Months with the highest number of snowfall days are January and February (3.8 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in July /
Average sunshine in July
Washington, DC

Average daylight in July / Average sunshine in July - Washington, DC
  • Average daylight in July: 14.6h

The month with the longest days is June (Average daylight: 14.9h).
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: 5.1).

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Average sunshine days in July
Washington, DC

Average sunshine days in July - Washington, DC
  • Average sunshine days in July: 13.1 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (12.8 days).

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Average UV index in July
Washington, DC

Average UV index in July - Washington, DC
  • Average UV index in July: 6

The month with the highest UV index is June (UV index 7).
Months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in July
Washington, DC

Average cloud cover in July - Washington, DC
  • 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).

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Average visibility in July
Washington, DC

Average visibility in July - Washington, DC
  • Average visibility in July: 9km

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

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