July weather forecast
Grand Isle, LA

July in Grand Isle is a summer month in the truest sense, with the highest temperature of the year at 86.9°F (30.5°C) and the most rainfall at 3.62" (92mm) over 19.8 days. Water activities can be enjoyed under the constant 14 hours of daylight, with the sea warming up to the year's highest temperature. Despite the increasing frequency of rainy days, Grand Isle weather in July is a vital part of the annual cycle, offering its unique charm under the summer sun. The city's weather in July itself becomes a spectacle, with high humidity coupled with intermittent rainfall contributing to the typical Louisiana summer vibe.

Temperature

The months of July and August see the peak of Grand Isle's temperatures, averaging a high of 86.9°F (30.5°C).

Heat index

In July, the average heat index is appraised at a very hot 98.6°F (37°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', melds the effects of warmth and moisture to generate a feeling of heat. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. 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 74%.

Rainfall

In Grand Isle, during July, the rain falls for 19.8 days and regularly aggregates up to 3.62" (92mm) of precipitation. Throughout the year, in Grand Isle, there are 151.9 rainfall days, and 22.01" (559mm) of precipitation is accumulated.

Snowfall

In Grand Isle, snow does not fall in February through December.

Ocean temperature

In Grand Isle, Louisiana, the average seawater temperature in July is 86.7°F (30.4°C).
Note: Temperatures exceeding 86°F (30°C) can compromise the refreshing quality of water activities.

Daylight

In Grand Isle, the average length of the day in July is 13h and 48min.
On the first day of July, sunrise is at 6:04 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 6:20 am and sunset at 7:52 pm CDT.

Sunshine

In July, the average sunshine is 10.7h.

UV index

The months with the highest UV index are May 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 the average person.
Note: The daily high UV index of 7 in July translates into this advice:
Fend off overexposure. Sun protection is vital. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be attentive! The UV exposure is heightened with reflections from sand and water.