July weather forecast
Port Isabel, TX

July in Port Isabel, Texas, is a tropical summer month, with an average temperature fluctuating between 86.9°F (30.5°C) and 81.1°F (27.3°C).

Temperature

The onset of July manifests an average high-temperature of a tropical 86.9°F (30.5°C), demonstrating a minor variation from the preceding month. During the nights of July, Port Isabel records an average temperature of 81.1°F (27.3°C), a minor drop from daytime peaks.

Heat index

For July, the heat index is evaluated at a fiery hot 100.4°F (38°C). Take more caution, heat exhaustion and heat cramps may occur. Long-lasting activity may cause heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle 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 'apparent temperature' or 'felt air temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

The average relative humidity in July is 77%.

Rainfall

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

Ocean temperature

In Port Isabel, Texas, the average seawater temperature in July is 84°F (28.9°C).
Note: Temperatures between 77°F (25°C) and 84.2°F (29°C) in water are ideal for swimming, diving, and other activities, providing enjoyment and comfort for extended durations.

Daylight

The average length of the day in July is 13h and 35min.
On the first day of July, sunrise is at 6:40 am and sunset at 8:25 pm. On the last day of the month, 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 risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In July, a daily maximum UV index of 7 leads to the following instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take note! Sand and water reflections strengthen the Sun's UV exposure.