July weather forecast
Ashburn, VA

July in Ashburn is the zenith of summer heat, with temperatures reaching their peak, higher than June and August. The relative humidity remains balanced, providing a comforting counterpoint to the increasing heat. The highest temperature recorded in July is a blistering 87.8°F (31°C), signifying the intensity of summer. However, the frequency of rain offers short relief, matching the frequency experienced in June.

Temperature

July temperatures tend to peak at an average high of 87.8°F (31°C) and dip to a low of 67.3°F (19.6°C).

Heat index

The heat index in July is computed to be a torrid 100.4°F (38°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

With an average relative humidity of 70%, July is the least humid month in Ashburn.

Rainfall

In Ashburn, in July, it is raining for 16.3 days, with typically 3.03" (77mm) of accumulated precipitation. Throughout the year, there are 158.1 rainfall days, and 31.46" (799mm) of precipitation is accumulated.

Snowfall

In Ashburn, snow does not fall in May through October.

Daylight

The average length of the day in July is 14h and 35min.
On the first day of July in Ashburn, Virginia, sunrise is at 5:48 am and sunset at 8:39 pm. On the last day of the month, sunrise is at 6:10 am and sunset at 8:22 pm EDT.

Sunshine

With an average of 10.7h of sunshine, July has the most sunshine of the year.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index of 6 during July leads to these instructions:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Stay sun-safe with clothing that is both closely woven and worn loosely.