New England
Plum Island
Merrimack River Entrance · Massachusetts · NOAA station 8440452 · Tide predictions
42.8167, -70.8200
Loading live tide data…
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
Loading…
H = high tide · L = low tide · highs & lows in local time
On the water nearby
Great Bay Buoy buoy · 18 mi N · Station 44074
Wind & wave reports →
Nearby tide stations
- Newburyport · 2.7 mi W
- Salisbury Point · 4.7 mi W
- Hampton Harbor · 5.4 mi N
- Plum Island Sound (south end) · 7.5 mi S
- Merrimacport · 8.5 mi W
Plan ahead
2027 tide extremes for this station
Highest predicted high tide: 10.1 ft — Tue Jul 6 · 1:23 AM
Lowest predicted low tide: -1.4 ft — Sat Jan 23 · 6:07 PM
Biggest single-day swing: 11.3 ft on Sat Jan 23
Best daytime minus tides of 2027
| Date | Low tide | Height |
|---|---|---|
| Sat Jan 23 | 6:07 PM | -1.4 ft |
| Sun Jan 24 | 6:55 PM | -1.4 ft |
| Fri Jan 22 | 5:18 PM | -1.3 ft |
| Sun Feb 21 | 5:46 PM | -1.1 ft |
| Wed Aug 4 | 7:28 AM | -1.1 ft |
| Tue Jul 6 | 7:50 AM | -1.1 ft |
| Wed Jul 7 | 8:40 AM | -1.1 ft |
| Sat Feb 20 | 4:58 PM | -1.1 ft |
| Mon Feb 22 | 6:31 PM | -1.0 ft |
| Thu Aug 5 | 8:16 AM | -1.0 ft |
190 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
Plum Island, Merrimack River Entrance is one of NOAA's reference tide stations — its predictions are computed directly from harmonic analysis of water levels observed here, and other nearby stations are calculated from it.
Rocky shores and the country's biggest northern ranges: Eastport flirts with 20 ft, and the Gulf of Maine funnels weather as much as tide. Harbors here float — or sit in the mud — on the moon's schedule.