July weather forecast
Alexandria, VA

July is the peak of summer in Alexandria, with temperatures soaring to a year's high of 87.8°F (31°C) and dipping to 69.1°F (20.6°C) at night. The sea temperature also peaks, aligning with increased beach activity and water sports. Experiencing the longest daylight hours, residents engage in various outdoor activities. Despite high temperatures, the relatively lower humidity makes weather bearable. In August, anticipate temperatures to recede slightly.

Temperature

July is the warmest month, with the temperature often reaching an average high of 87.8°F (31°C) and an average low of 69.1°F (20.6°C).

Heat index

The heat index value for July is evaluated at a fiery hot 100.4°F (38°C). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

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

Rainfall

In July, the rain falls for 16.5 days. Throughout July, 2.95" (75mm) of precipitation is accumulated. Throughout the year, there are 158.2 rainfall days, and 30.67" (779mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In July, the average ocean temperature in Alexandria is 76.5°F (24.7°C).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 76.5°F (24.7°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

In Alexandria, the average length of the day in July is 14h and 34min.
On the first day of July in Alexandria, 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 8:19 pm EDT.

Sunshine

The month with the most sunshine in Alexandria is July, with an average of 10.8h of sunshine.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 6 in July converts into the following recommendations:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.