July weather forecast
Port Isabel, TX

July is a hot summer month in Port Isabel, Texas, with temperature in the range of an average high of 86.9°F (30.5°C) and an average low of 81.1°F (27.3°C).

Temperature

The onset of July notes an average high-temperature of a hot 86.9°F (30.5°C), subtly shifted from June's 85.8°F (29.9°C). During July, the nighttime temperatures in Port Isabel align closely with the daytime averages, measuring a warm 81.1°F (27.3°C).

Heat index

The heat index value for July is evaluated at a fiery hot 100.4°F (38°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. Exposure to the direct sun might augment heat index values 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. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In Port Isabel, the average relative humidity in July is 77%.

Rainfall

In Port Isabel, during July, the rain falls for 10.4 days and regularly aggregates up to 2.6" (66mm) of precipitation. Throughout the year, there are 143.2 rainfall days, and 21.38" (543mm) of precipitation is accumulated.

Ocean temperature

In Port Isabel, the average seawater temperature in July is 84°F (28.9°C).
Note: Water temperature ranging from 77°F (25°C) to 84.2°F (29°C) is recognized as warm and pleasant by all, making water activities comfortable and delightful for long durations.

Daylight

The average length of the day in July is 13h and 35min.
On the first day of the month, sunrise is at 6:40 am and sunset at 8:25 pm. On the last day of July, in Port Isabel, sunrise is at 6:54 am and sunset at 8:15 pm CDT.

Sunshine

The month with the most sunshine is July, with an average of 11.3h of sunshine.

UV index

The months with the highest UV index are April through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum high UV index of 7 in July translates into the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Alert! UV radiation becomes sharper due to reflections from sand and water.