World Resorts USA Grand Isle Weather

Grand Isle weather in September

Weather in Grand Isle: September

Average day temperature: 82.2°F
Average night temperature: 79.8°F
Sea water temperature: 84.6°F
Number of sunny days: 12 days
Day length: 11.9 - 12.7 hours
Number of rainy days: 4 days
Precipitation totals: 2.6 in.

Air temperature in September, °F

Show year:
2024
2023
2022

The highest day temperature during September of 2024 was 85°F. At the same time the lowest night temperature was 74°F. Day and night temperature averages during September were 82.1°F and 79.9°F.

Sea water temperature in Grand Isle in September, °F

Show year:
2024
2023
2022

The average sea water temperature in September of 2024 was 84.4°F. The highest and lowest sea temperatures during the month were 86.5°F and 81.7°F.

Sunny, partly cloudy and cloudy days

Mostly all days in September are sunny but cloudy days are also possible.

Precipitation total in September, in.

Precipitation total value in Grand Isle in September is 2.6 in. Other months of the year show relatively similar values.

Wind speed in September, mph

The average wind speed value in September is 10.3 mph It makes September one of the least windy months of the year.

Average sunny hours

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 7.4.

Best time for vacation in Grand Isle

Sunniest months:
October 15 days
November 13 days
May 13 days
Warmest months:
August 85.9 °F
July 85.3 °F
June 83.7 °F
Warmest sea temp:
August 88.0 °F
July 87.0 °F
June 84.8 °F
Coldest months:
January 59.6 °F
February 61.3 °F
December 63.2 °F
Rainiest months:
July 6 days
August 5 days
June 4 days
Windiest months:
April 13.0 mph
January 12.8 mph
March 12.8 mph

Grand Isle on a weather map

Grand Isle
+75°F
E 11 mph
Feels like: +81°F
Precip.: 0%
Places in USA:
Name
°F
+37°F
+43°F
+75°F
+75°F
+50°F
+61°F
+75°F
+70°F
+39°F
+57°F
+55°F
+72°F
+73°F
+70°F
+48°F
24 Hours Forecast
Grand Isle
Local time: 00:34
November 14, thursday
0300
73°F
SE
11 mph
0600
70°F
SE
14 mph
0900
68°F
S
20 mph
1200
70°F
S
16 mph
1500
72°F
S
17 mph
1800
72°F
S
17 mph
2100
70°F
S
17 mph
November 15, friday
0000
66°F
S
17 mph
Units of measurement: °C / °F