July weather forecast
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 in Washington, District of Columbia, is a hot summer month, with an average temperature fluctuating between 88°F (31.1°C) and 69.1°F (20.6°C).

Temperature

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

Heat index

In July, the average heat index is calculated to be a very hot 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. 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 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, differences in body mass, height, and shape, metabolic differences), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. 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

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

Rainfall

In Washington, District of Columbia, during July, the rain falls for 16.4 days and regularly aggregates up to 2.76" (70mm) of precipitation. In Washington, District of Columbia, 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 July is 14h and 35min.
On the first day of July in Washington, sunrise is at 5:46 am and sunset at 8:37 pm. On the last day of the month, sunrise is at 6:08 am and sunset at 8:20 pm EDT.

Sunshine

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

UV index

The average daily maximum UV index in July in Washington, District of Columbia, is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In July, the average maximum UV index of 6 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for the 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?

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

What is the temperature in July in Washington?

In July, in Washington, District of Columbia, 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. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is calculated to be 100.8°F (38.2°C).

What are the least humid months in Washington?

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

What is the average humidity in July in Washington?

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

How much does it rain in Washington in July?

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

When it does not snow in Washington?

In Washington, snow does not fall in April through November.

How many hours of daylight does Washington have in July?

The average day length in July in Washington, District of Columbia, is 14h and 35min.

When are sunrise and sunset in July in Washington?

In July, on the first day of the month, sunrise is at 5:46 am and sunset at 8:37 pm. On the last day of the month, in Washington, sunrise is at 6:08 am and sunset at 8:20 pm EDT.

What month has the most sunshine in Washington?

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

How long on average sun shines in July in Washington?

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

What is the UV index intensity in July in Washington?

The average daily maximum UV index in July in Washington is 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.
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
Washington, DC

Average temperature in July - Washington, DC
  • 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 (40.6°F).

  • Average low temperature in July: 69.1°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).

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Average pressure in July
Washington, DC

Average pressure in July - Washington, DC
  • 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
Washington, DC

Average wind speed in July - Washington, DC
  • Average wind speed in July: 5.1mph

The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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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%).
The 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: 2.76"

The wettest month (with the highest rainfall) is August (3.46").
The driest month (with the least rainfall) is January (1.57").

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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: 0"

The month with the highest snowfall is January (2.17").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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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

The months with the highest number of snowfall days are January and February (3.8 days).
The 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: 14h and 35min

The month with the longest days is June (Average daylight: 14h and 51min).
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 6min).

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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).
The 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: 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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