July weather forecast
Washington, DC

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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, D.C. hits the annual temperature pinnacle from 69.1°F (20.6°C) to 88°F (31.1°C). Basking in the summer sun, city dwellers spend their time enjoying various outdoor attractions. From music festivals to food markets, the lively ambiance of the city is at a yearly high. Yet, the sweltering heat calls for the necessary precautions against sunstroke and dehydration. This month also brings appreciable gusts with wind power peaking at 7.8mph (12.6km/h).

Temperature

Washington's July weather reaches an average high of 88°F (31.1°C) and an average low of 69.1°F (20.6°C), making it the warmest month.

Heat index

In July, the average heat index is evaluated at a fiery hot 100.4°F (38°C). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'feels like', unifies temperature and humidity readings to offer a comprehensive feel of warmth. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

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

Rainfall

In Washington, in July, it is raining for 16.4 days, with typically 2.76" (70mm) of accumulated precipitation. In Washington, during the entire year, the rain falls for 149.1 days and collects up to 26.14" (664mm) of precipitation.

Snowfall

April through November are months without snowfall in Washington.

Daylight

In Washington, 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

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

UV index

In July, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The daily high UV index of 6 during July translates into the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the hottest in Washington?

In Washington, temperatures reach their average annual highs in July, measuring 88°F (31.1°C) and a minimum average of 69.1°F (20.6°C).

Is it hot in Washington during July?

In July, the average high-temperature and low-temperature in Washington are 88°F (31.1°C) and 69.1°F (20.6°C) respectively. The average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, in July is evaluated at 100.4°F (38°C).

What are the least humid months in Washington?

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

What is the average humidity in July in Washington?

The average relative humidity in July in Washington, District of Columbia, is 71%.

How many days does it rain in July in Washington?

In Washington, in July, it is raining for 16.4 days, with typically 2.76" (70mm) of accumulated precipitation.

When it does not snow in Washington?

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

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

The average day length in July in Washington is 14h and 35min.

When are sunrise and sunset in July in Washington?

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.

What month has the most sunshine in Washington?

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

How long on average sun shines in July in Washington?

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

How high is the UV index in July in Washington?

In July, the average daily maximum UV index in Washington, District of Columbia, is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unsafe 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
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).

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).

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).

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%).

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").

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).

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").

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).

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 4min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in July: 10h and 4min

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).

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).

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).

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).

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).

Washington, District of Columbia, USA

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