Grand Isle
Louisiana, USA
Long-term weather forecast
Long-term weather forecast

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, the same as December, is another enjoyable winter month in Grand Isle, Louisiana, with average temperature varying between 53.1°F (11.7°C) and 61.7°F (16.5°C). The coldest month is January, with an average high-temperature of 61.7°F (16.5°C) and an average low-temperature of 53.1°F (11.7°C). Weather in January »

February, the last month of the winter, in Grand Isle, is also an enjoyable month, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 64.6°F (18.1°C). In February, the average high-temperature is almost the same as in January - a still enjoyable 64.6°F (18.1°C). Weather in February »

March, the first month of the spring, in Grand Isle, is an agreeable month, with average temperature fluctuating between 68.9°F (20.5°C) and 61.3°F (16.3°C). In March, the average high-temperature is relatively the same as in February - an agreeable 68.9°F (20.5°C). Weather in March »

April in Grand Isle, Louisiana, is a moderately hot spring month, with average temperature varying between 67.3°F (19.6°C) and 74.3°F (23.5°C). In Grand Isle, the average high-temperature marginally rises, from a pleasant 68.9°F (20.5°C) in March, to a warm 74.3°F (23.5°C). Weather in April »

May, the last month of the spring, in Grand Isle, is another warm month, with average temperature fluctuating between 80.1°F (26.7°C) and 73.2°F (22.9°C). In Grand Isle, the average high-temperature in May slightly increases, from a moderately hot 74.3°F (23.5°C) in April, to a still warm 80.1°F (26.7°C). Weather in May »

The first month of the summer, June, is still a warm month in Grand Isle, Louisiana, with average temperature fluctuating between 85.5°F (29.7°C) and 79.7°F (26.5°C). In Grand Isle, the average high-temperature in June marginally rises, from 80.1°F (26.7°C) in May, to a still warm 85.5°F (29.7°C). Weather in June »

July is a hot summer month in Grand Isle, Louisiana, with temperature in the range of an average high of 86.9°F (30.5°C) and an average low of 80.6°F (27°C). July and August, with an average high-temperature of 86.9°F (30.5°C), are the warmest months. The average heat index is evaluated at a torrid 99.3°F (37.4°C). Weather in July »

The last month of the summer, August, is another hot month in Grand Isle, Louisiana, with average temperature fluctuating between 81.3°F (27.4°C) and 86.9°F (30.5°C). July and August, with an average high-temperature of 86.9°F (30.5°C), are the warmest months. In August, the average heat index is calculated to a very hot 99.3°F (37.4°C). Weather in August »

The first month of the autumn, September, is also a moderately hot month in Grand Isle, Louisiana, with average temperature fluctuating between 84.6°F (29.2°C) and 78.8°F (26°C). In September, the average high-temperature is essentially the same as in August - a warm 84.6°F (29.2°C). Weather in September »

October, like September, in Grand Isle, Louisiana, is another warm autumn month, with temperature in the range of an average high of 78.3°F (25.7°C) and an average low of 71.2°F (21.8°C). In October, the average high-temperature marginally drops, from a moderately hot 84.6°F (29.2°C) in September, to a still warm 78.3°F (25.7°C). Weather in October »

The last month of the autumn, November, is also an agreeable month in Grand Isle, Louisiana, with temperature in the range of an average low of 61.7°F (16.5°C) and an average high of 69.8°F (21°C). In November, the average high-temperature slightly decreases, from a moderately hot 78.3°F (25.7°C) in October, to a pleasant 69.8°F (21°C). Weather in November »

The first month of the winter, December, is still a comfortable month in Grand Isle, Louisiana, with average temperature ranging between min 56.7°F (13.7°C) and max 64.9°F (18.3°C). In Grand Isle, the average high-temperature in December is almost the same as in November - a comfortable 64.9°F (18.3°C). Weather in December »

What is the coldest month in Grand Isle?

January is the coldest month in Grand Isle, Louisiana, with an average high-temperature of 61.7°F (16.5°C) and an average low-temperature of 53.1°F (11.7°C).

How much does it rain in Grand Isle?

Throughout the year, in Grand Isle, Louisiana, there are 151.9 rainfall days, and 22.01" (559mm) of precipitation is accumulated.

When does it snow in Grand Isle?

The only month with snowfall in Grand Isle is January.

How many days does it snow in Grand Isle?

In Grand Isle, during the entire year, snow falls for 0.1 days.

What is the snowiest month in Grand Isle?

The month with the most snowfall days in Grand Isle is January when snow falls for 0.1 days.

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.

What are the months with the lowest UV index in Grand Isle?

Months with the lowest UV index in Grand Isle, Louisiana, are January and December, with an average maximum UV index of 4.

What is the most humid month in Grand Isle?

February and December, with an average relative humidity of 78%, are most humid months in Grand Isle.

What is the driest month in Grand Isle?

Months with the least rainfall in Grand Isle, Louisiana, are February and April Rain falls for 9.7 days and accumulates 0.87" (22mm) of rain.

When it does not snow in Grand Isle?

February through December are months without snowfall.

When is the highest UV index in Grand Isle?

May through September, with an average maximum UV index of 7, are months with the highest UV index.

When are the longest days in Grand Isle?

The month with the longest days in Grand Isle, Louisiana, is June, with an average of 14h of daylight.

What month has the most sunshine in Grand Isle?

June has the most sunshine of the year, with an average of 11h of sunshine.

What is the warmest month in Grand Isle?

Warmest months in Grand Isle are July and August, with an average high-temperature of 86.9°F (30.5°C).

What is the wettest month in Grand Isle?

August is the month with the most rainfall in Grand Isle. Rain falls for 20.7 days and accumulates 4.72" (120mm) of precipitation.

When is the ocean warmest in Grand Isle?

With an average ocean temperature of 87.4°F (30.8°C), August is the month with the warmest seawater in Grand Isle, Louisiana.

What is the least humid month in Grand Isle?

The least humid month in Grand Isle is October, with an average relative humidity of 71%.

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 in Grand Isle.

What is the month with the least sunshine in Grand Isle?

December has the least sunshine of the year in Grand Isle, Louisiana, with an average of 5.4h of sunshine.
Average temperature - Grand Isle, LA
Average humidity - Grand Isle, LA
Average rainfall - Grand Isle, LA

The wettest month (with the highest rainfall) is August (4.72").
Driest months (with the lowest rainfall) are February and April (0.87").

Average rainfall days - Grand Isle, LA

The month with the highest number of rainy days is August (20.7 days).
The month with the lowest number of rainy days is November (7.5 days).

Average snowfall days - Grand Isle, LA

The month with the highest number of snowfall days is January (0.1 days).
Months with the lowest number of snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

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 / Average sunshine - Grand Isle, LA
Average UV index - Grand Isle, LA