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Grand Isle Sea Temperature in January

Louisiana, United States

December Grand Isle year-round → February

Average sea temperature for Grand Isle, United States across January, based on 10 years of daily readings.

Average

19.12° C

High

22.83° C

Low

15.55° C

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

January is the 12th warmest of 12 months at Grand Isle. On average the water sits 5.7° than the year-round mean of 24.85° C.

Compared to December, January is 1.9° cooler than (21.01° C in December). By February the water is usually 19.33° C.

Grand Isle Day-by-Day Water Temperature in January

10-year low, average and high

14.0° C
16.5° C
19.0° C
21.5° C
24.0° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through January. Range Average

Each vertical bar above is one day of January. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Grand Isle.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

January Water Temperature Table for Grand Isle

10-year daily averages

Day Average Low High
January 1 20.58° C 19.05° C 22.8° C
January 2 20.66° C 19.29° C 22.83° C
January 3 20.21° C 18.03° C 22.64° C
January 4 19.88° C 17.52° C 22.09° C
January 5 19.69° C 17.53° C 21.89° C
January 6 19.57° C 17.48° C 21.62° C
January 7 19.4° C 17.4° C 21.82° C
January 8 19.42° C 17.45° C 22.06° C
January 9 19.63° C 17.84° C 22.22° C
January 10 19.6° C 17.91° C 22.34° C
January 11 19.61° C 17.66° C 21.87° C
January 12 19.69° C 17.59° C 21.69° C
January 13 19.63° C 17.54° C 21.39° C
January 14 19.31° C 16.95° C 20.94° C
January 15 18.94° C 16.14° C 20.85° C
January 16 18.92° C 15.83° C 20.81° C
January 17 18.91° C 16.25° C 20.8° C
January 18 19.06° C 16.69° C 21.53° C
January 19 19.15° C 17.12° C 20.86° C
January 20 19.08° C 17.57° C 20.4° C
January 21 18.88° C 17.14° C 20.24° C
January 22 18.88° C 17.56° C 20.98° C
January 23 18.7° C 17.44° C 20.82° C
January 24 18.4° C 16.1° C 20.69° C
January 25 18.28° C 15.91° C 21.1° C
January 26 18.23° C 15.85° C 21.27° C
January 27 18.45° C 16.58° C 20.86° C
January 28 18.3° C 16.37° C 20.81° C
January 29 17.99° C 16.4° C 19.49° C
January 30 17.95° C 15.9° C 19.4° C
January 31 17.87° C 15.55° C 19.68° C

Where January Sits in the Year

January highlighted

12.0° C
17.8° C
23.5° C
29.3° C
35.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
19.12° C
19.33° C
20.83° C
22.68° C
25.87° C
28.96° C
30.36° C
30.51° C
29.28° C
26.85° C
23.42° C
21.01° C
10-year monthly history for Grand Isle. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in January

Compare other United States water for the same month

Grand Isle Location

29.2366, -89.9873

29.23662, -89.98729 View on OpenStreetMap →

Grand Isle sits at 29.2366°N, 89.9873°W, on the coast of Louisiana, United States. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Grand Isle