LBI Ocean Temperature, Tides & Conditions

How tides work on Long Beach Island

Long Beach Island has semi-diurnal tides — two high tides and two low tides roughly every 24 hours and 50 minutes, so each day's tide times shift about 50 minutes later than the day before. There are two very different tides to watch on a barrier island. The ocean (oceanfront) tide is what surfers, swimmers, and anglers care about; the bay (back-bay) tide runs on the Barnegat Bay side and matters for boating, paddling, clamming, and flooding.

The two are not in sync: the bay tide typically lags the ocean tide and has a smaller range, because water has to flow in and out through Barnegat Inlet at the north end and Little Egg Inlet at the south. That's why we show the ocean and bay tide charts separately above — a low ocean tide does not mean low water in the bay. Tide heights also run higher around the new and full moon (spring tides) and lower at the quarter moons (neap tides).

Flooding on LBI: what to watch

Most LBI flooding is back-bay flooding on the bay side, not ocean overwash. On the highest tides of the month — especially when a high tide lines up with a strong, persistent onshore or northeast wind, or a coastal storm — bay water can push up over the lowest-lying streets and the Route 72 Causeway approach in Ship Bottom, the island's main on-and-off point. This is sometimes called "sunny-day" or nuisance flooding because it can happen with clear skies, purely from tide and wind.

The practical rule for residents and day-trippers: check the bay high-tide time above and the wind before you plan your drive on or off the island, and give the causeway extra time around a bay high tide during a wind event. For official warnings, always check the latest National Weather Service coastal-flood statements and our LBI alerts page.

Conditions by town

Tides and water temperature are essentially the same up and down the island, but badge prices, lifeguard hours, and beach rules differ by town. Pick yours: