July weather forecast
Rockville, MD

July in Rockville offers the warmest climate of the year, with temperatures soaring to an apex of 87.1°F (30.6°C) and falling to a relatively warmer 68.5°F (20.3°C). While rainfall is common, it doesn’t take away from sunshine hours, which hover around the maximum amounts experienced in June. The city is usually at its most vibrant during this time, reverberating with an abundance of summer activities. Hot days, extended daylight hours, and relatively reduced wind speeds characterize the preeminent summer month of Rockville.

Temperature

In Rockville, the month of July is known for its highest average temperatures, reaching a high of 87.1°F (30.6°C) and a low of 68.5°F (20.3°C).

Heat index

Throughout July, the heat index is calculated to be a very hot 98.6°F (37°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

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

Rainfall

In Rockville, during July, the rain falls for 16.6 days and regularly aggregates up to 2.99" (76mm) of precipitation. In Rockville, during the entire year, the rain falls for 156.4 days and collects up to 30.79" (782mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In July, the average length of the day is 14h and 35min.
On the first day of July, sunrise is at 5:46 am and sunset at 8:38 pm. On the last day of the month, sunrise is at 6:08 am and sunset at 8:20 pm EDT.

Sunshine

July has the most sunshine of the year, 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 health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 6 during July translates into the following guidance:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.