Climate and monthly weather forecast
Grand Isle, LA

The scenic Grand Isle, Louisiana, with a view of the numerous houses and the extended piers onto the calm seawater
The scenic Grand Isle, Louisiana, with a view of the numerous houses and the extended piers onto the calm seawater

Weather in January

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

Weather in February

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

Weather in March

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

Weather in April

April in Grand Isle, Louisiana, is a moderately hot spring month, with an average temperature ranging between min 67.3°F (19.6°C) and max 74.3°F (23.5°C). In April, the average high-temperature slightly increases from an agreeable 68.9°F (20.5°C) in March to a moderately hot 74.3°F (23.5°C). Weather in April »

Weather in May

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

Weather in June

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

Weather in July

July is a tropical summer month in Grand Isle, Louisiana, with an average temperature fluctuating between 86.9°F (30.5°C) and 80.6°F (27°C). The warmest months are July and August, with an average high-temperature of 86.9°F (30.5°C). In July, the average heat index is appraised at a torrid 98.6°F (37°C). Weather in July »

Weather in August

The last month of the summer, August, is another tropical month in Grand Isle, Louisiana, with an average temperature varying 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. The average heat index in August is appraised at a very hot 98.6°F (37°C). Weather in August »

Weather in September

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

Weather in October

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

Weather in November

November, the last month of the autumn in Grand Isle, is also an agreeable month, 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 Grand Isle, Louisiana, the average high-temperature in November marginally drops from a warm 78.3°F (25.7°C) in October to a pleasant 69.8°F (21°C). Weather in November »

Weather in December

December, the first month of the winter in Grand Isle, is still a comfortable month, with temperature in the range of an average high of 64.9°F (18.3°C) and an average low of 56.7°F (13.7°C). In December, the average high-temperature is essentially the same as in November - an enjoyable 64.9°F (18.3°C). Weather in December »
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FAQ

What is the coldest month in Grand Isle?

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

How many days does it rain in Grand Isle?

Throughout the year, 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, Louisiana, is January.

When does it snow the most in Grand Isle?

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

How many days does it snow in Grand Isle?

Throughout the year, in Grand Isle, there are 0.1 snowfall days.

When is the ocean coldest in Grand Isle?

The month with the coldest seawater is January, with an average ocean temperature of 61.3°F (16.3°C).

When is the lowest UV index in Grand Isle?

The months with the lowest UV index are January and December, with an average maximum UV index of 4.

What is the most humid month in Grand Isle?

The months with the highest humidity are February and December, with an average relative humidity of 78%.

What is the driest month in Grand Isle?

February and April are months with the least rain when the rain falls for 9.7 days and typically aggregates up to 0.87" (22mm) of rain.

When it does not snow in Grand Isle?

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

When is Daylight Saving Time (DST) in Grand Isle?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from CDT to CST.

When is the highest UV index in Grand Isle?

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

When are the longest days in Grand Isle?

June has the longest days of the year in Grand Isle, Louisiana, with an average of 13h and 59min of daylight.

What month has the most sunshine in Grand Isle?

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

What are the warmest months in Grand Isle?

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

What is the wettest month in Grand Isle?

The month with the most rainfall is August, when the rain falls for 20.7 days and typically aggregates up to 4.72" (120mm) of precipitation.

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.

What is the least humid month in Grand Isle?

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

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

The month with the shortest days in Grand Isle is December, with an average of 10h and 19min of daylight.

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 temperature - Grand Isle, LA

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).

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).

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Average pressure
Grand Isle, LA

Average pressure - Grand Isle, LA

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).

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Average wind speed
Grand Isle, LA

Average wind speed - Grand Isle, LA

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).

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Average humidity
Grand Isle, LA

Average humidity - Grand Isle, LA

The months with the highest relative humidity are February and December (78%).
The month with the lowest relative humidity is October (71%).

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Average rainfall
Grand Isle, LA

Average rainfall - Grand Isle, LA

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

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Average rainfall days
Grand Isle, LA

Average rainfall days - Grand Isle, LA

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).

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Average snowfall days
Grand Isle, LA

Average snowfall days - Grand Isle, LA

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).

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Average sea temperature
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).

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Average daylight / Average sunshine
Grand Isle, LA

Average daylight / Average sunshine - Grand Isle, LA

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).

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).

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Average sunshine days
Grand Isle, LA

Average sunshine days - Grand Isle, LA

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is August (6.5 days).

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Average UV index
Grand Isle, LA

Average UV index - Grand Isle, LA

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).

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Average visibility
Grand Isle, LA

Average visibility - Grand Isle, LA

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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