August weather forecast
Williamsburg, VA

August carries forward the warmth of summer in Williamsburg, with a slight drop in temperatures to between 69.8°F (21°C) and 86.5°F (30.3°C). However, with rainfall peaking at a year's high of 2.36" (60mm), this month can be particularly wet. The richness of nature comes into the full view as plant life continues to thrive under a 13.5-hour daylight period, making the city a sight to behold. Despite being a summer month, August subtly hints at the arrival of fall, as the days gradually start to shorten. Regardless, the weather stays pleasantly warm, inviting residents and tourists alike to continue their outdoor activities.

Temperature

The arrival of August coincides with an average high-temperature of a still hot 86.5°F (30.3°C), indicating a minimal shift from July's 88.3°F (31.3°C). Throughout August, Williamsburg witnesses a nighttime temperature average of 69.8°F (21°C).

Heat index

During August, the heat index is appraised at a very hot 98.6°F (37°C). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', provides an understanding of perceived warmth by combining temperature and relative humidity. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Williamsburg, the average relative humidity in August is 75%.

Rainfall

The month with the most rainfall is August, when the rain falls for 16.3 days and typically aggregates up to 2.36" (60mm) of precipitation.

Snowfall

In Williamsburg, snow does not fall in April through October.

Daylight

In August, the average length of the day is 13h and 33min.
On the first day of the month, sunrise is at 6:12 am and sunset at 8:14 pm. On the last day of August, sunrise is at 6:37 am and sunset at 7:36 pm EDT.

Sunshine

In Williamsburg, the average sunshine in August is 10.4h.

UV index

The average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In August, the UV index of 6 transforms into the following advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.