New England
Portsmouth
New Hampshire · NOAA station 8423745 · Tide predictions
43.0783, -70.7517
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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 Bay Buoy buoy · 6 mi W · Station 44074
Wind & wave reports →
Nearby tide stations
- Seavey Island · 0.5 mi E
- Atlantic Heights · 1.0 mi NW
- Fort Point · 2.1 mi E
- Jaffrey Point · 2.4 mi SE
- Kittery Point · 2.5 mi E
Plan ahead
2027 tide extremes for this station
Highest predicted high tide: 10.0 ft — Tue Jul 6 · 1:16 AM
Lowest predicted low tide: -1.6 ft — Sat Jan 23 · 5:55 PM
Biggest single-day swing: 11.5 ft on Sat Jan 23
Best daytime minus tides of 2027
| Date | Low tide | Height |
|---|---|---|
| Sat Jan 23 | 5:55 PM | -1.6 ft |
| Sun Jan 24 | 6:44 PM | -1.5 ft |
| Fri Jan 22 | 5:04 PM | -1.4 ft |
| Sun Feb 21 | 5:35 PM | -1.4 ft |
| Wed Aug 4 | 7:17 AM | -1.3 ft |
| Tue Jul 6 | 7:38 AM | -1.3 ft |
| Sat Feb 20 | 4:47 PM | -1.3 ft |
| Mon Feb 22 | 6:21 PM | -1.2 ft |
| Wed Jul 7 | 8:30 AM | -1.2 ft |
| Thu Aug 5 | 8:07 AM | -1.2 ft |
194 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 Portsmouth from the PORTLAND station: high tides about 0.86× the height, 22 min later; low tides about 0.86× the height, 17 min later.
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.