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

In Grand Isle, the warmest period comes during July and August, when the average high-temperature touches 86.9°F (30.5°C).

Heat index

July's average heat index is appraised at a sweltering 98.6°F (37°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
Keep in mind the heat index values are meant for areas in shade and with light wind. Exposure to the direct sun could elevate the heat index by 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 impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for babies and toddlers. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In July, the average relative humidity in Grand Isle is 74%.

Rainfall

In Grand Isle, in July, it is raining for 19.8 days, with typically 3.62" (92mm) of accumulated precipitation. In Grand Isle, during the entire year, the rain falls for 151.9 days and collects up to 22.01" (559mm) of precipitation.

Snowfall

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

Ocean temperature

In July, the average ocean temperature in Grand Isle is 86.7°F (30.4°C).
Note: Engaging in intense water activities can feel less refreshing when the temperature is above 86°F (30°C).

Daylight

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 in Grand Isle is 10.7h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 7 during July translates into these guidelines:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. 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. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Stay vigilant! UV rays get a boost in intensity due to sand and water reflections.