August weather forecast
Manassas, VA

August weather conditions in Manassas remain notably similar to July. Average high temperatures slightly lower from the July high, hitting 85.8°F (29.9°C). Rainfall in the city bumps up, with precipitation reaching the peak volume of the year. The city witnesses an increase in cloud cover, promising some natural shelter from the intense sunlight of the summer. By the end of August, the slowly shortening days and milder temperatures signal the impending cessation of summer.

Temperature

Manassas, Virginia, sees the arrival of August with an average high-temperature of a warm 85.8°F (29.9°C), indicating a subtle variation from July. Manassas in August experiences a low-temperature average of 65.8°F (18.8°C).

Heat index

The heat index value for August is evaluated at a torrid 96.8°F (36°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', blends air temperature and moisture content to represent the felt temperature to humans. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Manassas, the average relative humidity in August is 74%.

Rainfall

The month with the most rainfall is August, when the rain falls for 16.3 days and typically aggregates up to 3.43" (87mm) of precipitation.

Snowfall

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

Daylight

In August, the average length of the day in Manassas is 13h and 38min.
On the first day of the month, sunrise is at 6:11 am and sunset at 8:20 pm. On the last day of August, in Manassas, sunrise is at 6:38 am and sunset at 7:41 pm EDT.

Sunshine

In August, the average sunshine in Manassas is 10.1h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 6 in August transforms into the following instructions:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.