July weather forecastWashington, DC

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.