July weather forecast
Arlington, VA

July is undisputedly the hottest month in Arlington, with temperatures soaring up to an areal high of 88°F. 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

July is the month when Arlington sees the highest average temperatures, with a high of 88°F and a low of 69.1°F.

Heat index

For July, the heat index is evaluated at a very hot 100.4°F. Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

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

Rainfall

In July, the rain falls for 16.4 days. Throughout July, 2.76" of precipitation is accumulated. Throughout the year, there are 149.1 rainfall days, and 26.14" of precipitation is accumulated.

Snowfall

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

Daylight

In July, the average length of the day in Arlington is 14h and 35min.
On the first day of the month, sunrise is at 5:46 am and sunset at 8:37 pm. On the last day of July, in Arlington, Virginia, sunrise is at 6:08 am and sunset at 8:21 pm EDT.

Sunshine

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

UV index

The average daily maximum UV index in July is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index, 6 during July, leads to the following recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.