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 is the month when Gaithersburg's temperatures reach their peak, with averages of 86.9°F (30.5°C) and lows of 67.6°F (19.8°C).

Heat index

For most parts of July, the heat index is evaluated at a very hot 98.6°F (37°C). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Note that heat index values are valued for light wind and location in the shade. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. 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.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

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

Rainfall

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

Snowfall

June through October are months without snowfall.

Daylight

The average length of the day in July is 14h and 36min.
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 6:09 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.

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: In July, the maximum UV index of 6 translates into these guidelines:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.