Typical August highs at Grand Isle Beach reach about 86°F, with reliable beach weather April to October. Grand Isle Beach is located in Jefferson Parish, Louisiana.
Jefferson Parish, Louisiana · live parking & conditions · updated June 19, 2026
In a typical year August is the warmest month here, with highs near 86°F, and it's reliably beach weather April to October. Tap Grand Isle Beach on the map for live surf, wind, water temperature, UV and tide times.
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