Monthly weather forecast and climate
Grand Isle, LA

An aerial drone shot over the scenic Grand Isle, Louisiana, with a view of the numerous houses and the extended piers onto the calm seawater
An aerial drone shot over the scenic Grand Isle, Louisiana, with a view of the numerous houses and the extended piers onto the calm seawater
January and December, with an average high-temperature of 64.9°F (18.3°C), are the coldest months. Throughout January, 4.7" (120.1mm) of precipitation is accumulated.
Weather in January »
The average high-temperature, in February, is 66°F (18.9°C), while the average low-temperature is 50°F (10°C). Throughout February, 4.7" (118.6mm) of precipitation is accumulated.
Weather in February »
In March, in Grand Isle, Louisiana, the average high-temperature is 71.1°F (21.7°C), and the average low-temperature is 53.1°F (11.7°C). In Grand Isle, 4.8" (122.7mm) of precipitation is typically accumulated.
Weather in March »
In Grand Isle, Louisiana, in April, the average high-temperature is 77°F (25°C), and the average low-temperature is 60.1°F (15.6°C). In Grand Isle, Louisiana, 5.6" (141.2mm) of precipitation is typically accumulated.
Weather in April »
In May, the average high-temperature is 84°F (28.9°C), and the average low-temperature is 69.1°F (20.6°C). During May, Grand Isle regularly aggregates up to 3.8" (96.3mm) of precipitation.
Weather in May »
In Grand Isle, the average high-temperature is 88°F (31.1°C), and the average low-temperature is 73.9°F (23.3°C). In Grand Isle, 6.5" (166.1mm) of precipitation is typically accumulated.
Weather in June »
July and August, with an average high-temperature of 90°F (32.2°C), are warmest months. Throughout July, 7.4" (186.9mm) of precipitation is accumulated.
Weather in July »
July and August, with an average high-temperature of 90°F (32.2°C), are warmest months in Grand Isle. August is the month with the most rainfall, with 7.8" (198.4mm) of accumulated precipitation.
Weather in August »
In Grand Isle, the average high-temperature is 87.1°F (30.6°C), and the average low-temperature is 73°F (22.8°C). During September, Grand Isle regularly aggregates up to 6.7" (169.9mm) of precipitation.
Weather in September »
In Grand Isle, in October, the average high-temperature is 80.1°F (26.7°C), and the average low-temperature is 64°F (17.8°C). In Grand Isle, 4.3" (110.2mm) of precipitation is typically accumulated.
Weather in October »
The average high-temperature, in Grand Isle, is 72°F (22.2°C), while the average low-temperature is 55.9°F (13.3°C). The month with the least rainfall is November when 3.4" (85.3mm) of precipitation is typically aggregated.
Weather in November »
January and December, with an average high-temperature of 64.9°F (18.3°C), are the coldest months. In Grand Isle, in December, 4.4" (110.7mm) of precipitation is typically accumulated.
Weather in December »

What are the coldest months in Grand Isle?

The coldest months are January and December, with an average high-temperature of 64.9°F (18.3°C).

How much does it rain in Grand Isle?

During the entire year, Grand Isle aggregates up to 64" (1626.4mm) of precipitation.

What is the month with the coldest ocean in Grand Isle?

With an average ocean temperature of 61.3°F (16.3°C), January is the month with the coldest seawater. For swimming, a surface water temperature of 61.3°F (16.3°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

When are the longest days in Grand Isle?

With an average of 14h of daylight, June has the longest days of the year.

What are the warmest months in Grand Isle?

July and August, with an average high-temperature of 90°F (32.2°C), are warmest months in Grand Isle, Louisiana.

What is the wettest month in Grand Isle?

The month with the most rainfall in Grand Isle, Louisiana, is August when 7.8" (198.4mm) of precipitation is typically aggregated.

What is the month with the warmest ocean in Grand Isle?

With an average ocean temperature of 87.4°F (30.8°C), August is the month with the warmest seawater. For swimming, other intense water activities, temperature above 86°F (30°C) is arguably unpleasant, as the water cooling effect is missing.

What is the driest month in Grand Isle?

November is the month with the least rainfall, with 3.4" (85.3mm) of accumulated precipitation.

What is the month with the shortest days in Grand Isle?

With an average of 10.3h of daylight, December has the shortest days of the year.
Average rainfall - Grand Isle, LA
Average sea temperature - Grand Isle, LA

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 - Grand Isle, LA

The month with the longest days is June (Average daylight: 14h).
The month with shortest days is December (Average daylight: 10.3h).

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