Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall days in August
- Average sea temperature in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
July and August, with an average high-temperature of 86.9°F (30.5°C), are the warmest months.Heat index
The average heat index in August is calculated to be a sweltering 98.6°F (37°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, wind, differences in body mass, height, and shape, and metabolic differences affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.
Humidity
In August, the average relative humidity is 74%.Rainfall
August is the month with the most rainfall in Grand Isle, Louisiana. Rain falls for 20.7 days and accumulates 4.72" (120mm) of precipitation.Snowfall
February through December are months without snowfall.Ocean temperature
The month with the warmest seawater in Grand Isle is August, with an average ocean temperature of 87.4°F (30.8°C).Note: The surface water temperatures above 86°F (30°C) are arguably considered as unpleasant for swimming, and any intense water activity, as the refreshing effect of water is missing.
Daylight
In August, the average length of the day is 13h and 10min.On the first day of August, sunrise is at 6:20 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 7:23 pm CDT.
Sunshine
The average sunshine in August in Grand Isle, Louisiana, is 10.8h.UV index
The months with the highest UV index in Grand Isle are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for average individuals.Note: The daily maximum UV index of 7 in August interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
FAQ
What are the warmest months in Grand Isle?
What is the temperature in August in Grand Isle?
What is the average humidity in August in Grand Isle?
What is the rainiest month in Grand Isle?
How many days does it rain in August in Grand Isle?
When it does not snow in Grand Isle?
When is the ocean warmest in Grand Isle?
What is the ocean temperature in August in Grand Isle?
What is the average length of the day in August in Grand Isle?
When is the sunrise / sunset in August in Grand Isle?
How many hours of sunshine does Grand Isle have in August?
When is the highest UV index in Grand Isle?
What is the UV index reading in August in Grand Isle?
Average temperature in August
Grand Isle, LA
- Average high temperature in August: 86.9°F
The warmest months (with the highest average high temperature) are July and August (86.9°F).
The month with the lowest average high temperature is January (61.7°F).
- Average low temperature in August: 81.3°F
The month with the highest average low temperature is August (81.3°F).
The coldest month (with the lowest average low temperature) is January (53.1°F).
Average pressure in August
Grand Isle, LA
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in August
Grand Isle, LA
- Average wind speed in August: 8.1mph
The windiest month (with the highest average wind speed) is January (12.4mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in August
Grand Isle, LA
- Average humidity in August: 74%
The months with the highest relative humidity are February and December (78%).
The month with the lowest relative humidity is October (71%).
Average rainfall in August
Grand Isle, LA
- Average rainfall in August: 4.72"
The wettest month (with the highest rainfall) is August (4.72").
The driest months (with the least rainfall) are February and April (0.87").
Average rainfall days in August
Grand Isle, LA
- Average rainfall days in August: 20.7 days
The month with the highest number of rainy days is August (20.7 days).
The month with the least rainy days is November (7.5 days).
Average snowfall days in August
Grand Isle, LA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average sea temperature in August
Grand Isle, LA
- Average sea temperature in August: 87.5°F
The best month for swimming (with the highest average sea temperature) is August (87.5°F).
The coldest month (with the lowest average sea temperature) is January (61.4°F).
Average daylight in August /
Average sunshine in August
Grand Isle, LA
- Average daylight in August: 13h and 10min
The month with the longest days is June (Average daylight: 13h and 59min).
The month with the shortest days is December (Average daylight: 10h and 19min).
- Average sunshine in August: 10h and 48min
The month with the most sunshine is June (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in August
Grand Isle, LA
- Average sunshine days in August: 6.5 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is August (6.5 days).
Average UV index in August
Grand Isle, LA
- Average UV index in August: 7
The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in August
Grand Isle, LA
- Average cloud cover in August: 27
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is May (Cloud cover 23).
Average visibility in August
Grand Isle, LA
- Average visibility in August: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
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