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 tropical summer month, with an average temperature fluctuating between 88°F (31.1°C) and 69.1°F (20.6°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

The average heat index in July is computed to be a torrid 100.4°F (38°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'apparent temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, metabolic differences, wind), and activity. 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. 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.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. 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 in Washington.

Rainfall

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

In July, the average length of the day is 14h and 35min.
On the first day of July, 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 in Washington, with an average of 10.7h of sunshine.

UV index

In Washington, the average daily maximum UV index in July is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 in July transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. 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.
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FAQ

What is the warmest month in Washington?

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).

What is the temperature in July in Washington?

The average high-temperature, in July, in Washington, District of Columbia, is 88°F (31.1°C), while the average low-temperature is 69.1°F (20.6°C). in July, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 100.4°F (38°C).

What is the least humid month in Washington?

The months with the lowest humidity in Washington, District of Columbia, 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 is 71%.

How many days does it rain in July in Washington?

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

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

In Washington, the average day length in July is 14h and 35min.

When is the sunrise / 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, sunrise is at 6:08 am and sunset at 8:20 pm EDT.

What month has the most sunshine in Washington?

The month with the most sunshine in Washington is July, with an average of 10.7h of sunshine.

How long on average sun shines in July in Washington?

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

What is the UV index reading 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 hazard to health from exposure to the Sun's 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
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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