July weather forecast
Arlington, VA

July is undisputedly the hottest month in Arlington, with temperatures soaring up to an areal high of 88°F (31.1°C). Despite being at the height of summer, the city doesn't shy away from rainfall, often leading to a humid climate. While wearing light and breathable clothing is recommended, it is also essential to apply sufficient sun protection due to the high UV index level of 6. The long daylight hours continue, inviting people to relish outdoor activities like barbeques and picnics.

Temperature

Arlington's warmest month, July, registers temperatures that range from a high of 88°F (31.1°C) to a low of 69.1°F (20.6°C).

Heat index

In July, the heat index is appraised at a very hot 100.4°F (38°C). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

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

Rainfall

In July, in Arlington, the rain falls for 16.4 days. Throughout July, 2.76" (70mm) of precipitation is accumulated. In Arlington, 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.

Daylight

The average length of the day in July is 14h and 35min.
On the first day of July in Arlington, sunrise is at 5:47 am and sunset at 8:37 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 8:20 pm EDT.

Sunshine

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

UV index

In July, the average daily maximum UV index in Arlington is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 6 in July translates into these instructions:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.