Grand Isle Water Temperature
29°C / 85°F
The measurements for the water temperature in Grand Isle, Louisiana are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.
Monthly average water temp
Monthly average max / min water temperatures
The graph below shows the range of monthly Grand Isle water temperature derived from many years of historical sea surface temperature data.
The warmest water temperature is in August with an average around 87.3°F / 30.7°C. The coldest month is January with an average water temperature of 58.6°F / 14.8°C.
7 day tide forecast for Grand Isle
*These tide times are estimates based on the nearest accurate location (Bayou Rigaud, Grand Isle, Mississippi River Delta, Louisiana) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.