July weather forecast
Lewisville, TX

July is the peak of summer in Lewisville, indicating the highest temperatures of the year with an average high of 95.2°F (35.1°C). The number of sunshine days reaches its zenith during this month, resulting in clear, sunny days. Despite the high temperatures, the average rainfall remains relatively low, bringing limited reprieve from the heat. As the calendar marches towards August, a slight decrease in temperature can be sensed as summer begins to fade.

Temperature

July's arrival in Lewisville shows an average high-temperature of a fiery hot 95.2°F (35.1°C), hardly different from the previous month. Lewisville experiences an average nighttime temperature of 76.6°F (24.8°C) in the month of July.

Heat index

In July, the heat index is computed to be a blazing hot 113°F (45°C). Alert: Heat cramps and heat exhaustion are likely to occur. Prolonged exertion can lead to heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. 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 'felt air temperature' or 'apparent temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In July, the average relative humidity is 59%.

Rainfall

In Lewisville, in July, it is raining for 11.5 days, with typically 2.01" (51mm) of accumulated precipitation. Throughout the year, in Lewisville, there are 132.1 rainfall days, and 29.09" (739mm) of precipitation is accumulated.

Snowfall

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

Daylight

In July, the average length of the day in Lewisville is 14h and 5min.
On the first day of July in Lewisville, sunrise is at 6:23 am and sunset at 8:40 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 8:27 pm CDT.

Sunshine

July and August, with an average of 11h of sunshine, are months with the most sunshine in Lewisville.

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index in Lewisville, Texas. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A daily maximum UV index of 7 in July translates into the following instructions:
Resist extreme sun exposure. Guarding against solar damage is essential. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Boost your sun resistance with garments that are densely woven yet spacious.