July weather forecast
Gaithersburg, MD

July, the hot and humid peak of summer is graced with the highest average temperatures between 67.6°F (19.8°C) and 86.9°F (30.5°C). Known for its sunny and clear skies, July is the ideal month for soaking up the Gaithersburg summer sun. Rainfall events are experienced, though they do not prudently cut through the prevailing heat. Despite the rise in humidity levels and occasional storms, outdoor activities continue to be a draw owing to long sunny days.

Temperature

July, recognised by an average high temperature of 86.9°F (30.5°C) and a low of 67.6°F (19.8°C), is Gaithersburg's warmest month.

Heat index

July's heat index is estimated at a very hot 98.6°F (37°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Heat index values are typically calculated for conditions of shade and a light breeze. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. 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 extremely significant for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. 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 body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

July is the least humid month, with an average relative humidity of 72%.

Rainfall

In July, the rain falls for 16.8 days. Throughout July, 3.07" (78mm) of precipitation is accumulated. In Gaithersburg, Maryland, during the entire year, the rain falls for 154.8 days and collects up to 29.09" (739mm) of precipitation.

Snowfall

In Gaithersburg, Maryland, snow does not fall in June through October.

Daylight

The average length of the day in July is 14h and 36min.
On the first day of the month, sunrise is at 5:46 am and sunset at 8:38 pm. On the last day of July, in Gaithersburg, sunrise is at 6:09 am and sunset at 8:21 pm EDT.

Sunshine

With an average of 10.8h of sunshine, July has the most sunshine of the year in Gaithersburg, Maryland.

UV index

The months with the highest UV index in Gaithersburg are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 6 in July translates into these instructions:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.