Mid-Atlantic
Mount Sinai Harbor
New York · NOAA station 8514421 · Tide predictions
40.9633, -73.0400
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48-hour outlook
Drag across the curve to inspect any time. Weather icons show the forecast at each high tide.
Drawn from the high/low predictions — NOAA publishes high/low only for this station.
The next seven days
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H = high tide · L = low tide · highs & lows in local time
On the water nearby
Great South Bay buoy · 18 mi S · Station 44069
Wind & wave reports →
Nearby tide stations
- Cedar Beach · 0.2 mi NW
- Port Jefferson · 2.1 mi SW
- Port Jefferson Harbor entrance · 2.8 mi W
- Patchogue · 14.8 mi S
- Sniffens Point · 15.9 mi N
Plan ahead
2027 tide extremes for this station
Highest predicted high tide: 7.5 ft — Thu Sep 30 · 11:53 AM
Lowest predicted low tide: -1.0 ft — Sat Jan 23 · 6:17 PM
Biggest single-day swing: 8.0 ft on Sat Jan 23
Best daytime minus tides of 2027
| Date | Low tide | Height |
|---|---|---|
| Sat Jan 23 | 6:17 PM | -1.0 ft |
| Fri Jan 22 | 5:27 PM | -1.0 ft |
| Sun Feb 21 | 5:54 PM | -0.9 ft |
| Sat Feb 20 | 5:07 PM | -0.9 ft |
| Mon Feb 22 | 6:40 PM | -0.8 ft |
| Thu Jan 21 | 4:36 PM | -0.8 ft |
| Tue Feb 23 | 7:06 AM | -0.8 ft |
| Mon Jan 25 | 7:26 AM | -0.7 ft |
| Fri Feb 19 | 4:18 PM | -0.7 ft |
| Wed Mar 24 | 7:43 AM | -0.6 ft |
179 minus tides (below 0 ft) are predicted here in 2027. The table shows up to the 10 lowest that fall between 7 AM and 7 PM — the ones worth planning a clam dig or tidepool walk around.
About this station
NOAA builds the predictions for Mount Sinai Harbor from the BRIDGEPORT station: high tides about 0.89× the height, 4 min later; low tides about 0.88× the height, 18 min later.
Barrier islands, big bays, and river tides: Chesapeake and Delaware bays carry the tide deep inland, and a nor'easter can hold water in, or blow it out, for days at a time.