Portsmouth Tides Today
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Portsmouth runs a mean tidal range of about 7.7 ft. This month the highest water, 9.9 ft, comes on the morning of Nov 26, and the lowest, a -1.3 ft minus tide, on the evening of Nov 25.
| High tide | 6:08 AM | 7.7 ft |
| Low tide | 12:04 PM | 0.9 ft |
| High tide | 6:27 PM | 8.2 ft |
Today on the water at Portsmouth
Today at Portsmouth: high tide at 6:08 AM (7.7 ft) and 6:27 PM (8.2 ft), low tide at 12:04 PM (0.9 ft). The National Weather Service forecast for Tuesday is partly sunny with winds 0 mph, 67°F. Sunrise is at 6:19 AM and sunset at 4:34 PM.
| Period | Forecast | Wind | Temp |
|---|---|---|---|
| Overnight | Mostly Cloudy | 0 mph | 47°F |
| Tuesday | Partly Sunny | 0 mph | 67°F |
Forecast: National Weather Service point forecast for this location.
Where Portsmouth is
Portsmouth sits at 43.0783° N, 70.7517° W on the Gulf of Maine, at Portsmouth, NH, in Rockingham County. The station here is a subordinate tide prediction point. NOAA has no gauge in the water at this spot; its times and heights are published as offsets from a reference gauge, named below. The closest gauge measuring live water level is Seavey Island (NOAA 8419870), 0.5 mi away, and the tide here runs on nearly the same clock. The nearest weather station is Seavey Island, ME, a shore station reporting wind and, at most sites, water temperature, 0.5 mi away.
The tide at Portsmouth
Portsmouth has a semidiurnal tide: two highs and two lows a day of about the same size, roughly 12 hours 25 minutes apart. This month's predictions average 1.9 high tides a day here. For the water around it: Gulf of Maine tides are semidiurnal and large, 9 ft at Boston rising past 18 ft toward the Bay of Fundy.
About this station
- NOAA predicts tides here from Portland, station 8418150. High tide comes about 22 min later and low tide about 17 min later than there.
- High tide heights run about 0.86 times the reference.
Datum and source
Heights on this page are feet above mean lower low water (MLLW), the zero NOAA's nautical charts use for soundings. A predicted 0.0 ft low is the average of the lower low each day; a minus tide is water below chart datum, and a 2 ft high means 2 ft more water than the chart shows. NOAA publishes no datums for this point. Its predictions are offsets from Portland and are referenced to MLLW there. Source: NOAA CO-OPS station 8423745. The tide times and heights are published as time and height offsets from its reference gauge; TidalMap republishes them daily and does not alter them.
Tide stations near Portsmouth
- Fort Point: 2.1 mi, tides about 13 min earlier
- Dover Point: 5.1 mi, tides about 70 min later
- Gosport Harbor, Isles of Shoals: 9.8 mi, tides about 20 min earlier
- Dover, Cocheco River: 10.2 mi, tides about 81 min later
- Hampton Harbor: 13.1 mi, tides about 4 min later
TidalMapMonthly tide calendar
🌊 Biggest flood tides at Portsmouth this month: Nov 23, Nov 24, Nov 25, Nov 26, Nov 27, Nov 28. These spring highs push water up into the grass and over the oyster rock; prime for poling into flooded marsh for tailing reds.
🔻 Negative (minus) low tides at Portsmouth this month: Nov 7, Nov 8, Nov 9, Nov 10, Nov 22, Nov 23, Nov 24, Nov 25, Nov 26, Nov 27, Nov 28, Nov 29 …. These drain the flats and expose the oyster rock, prime for sight-fishing and clamming.
Best fishing times (solunar)
Major and minor solunar windows for Portsmouth, peak feeding activity is around the moon overhead/underfoot (majors) and moonrise/moonset (minors). Score is the day's activity coefficient (0–100).
| Day | Major windows | Minor windows | Score |
|---|---|---|---|
| Today 🌗 | 6:08–8:08 AM 6:33–8:33 PM | 11:05–1:05 AM 12:56–2:56 PM | 47 |
| Wed Nov 4 🌗 | 6:56–8:56 AM 7:21–9:21 PM | 12:20–2:20 AM 1:18–3:18 PM | 61 |
| Thu Nov 5 🌘 | 7:42–9:42 AM 8:07–10:07 PM | 1:33–3:33 AM 1:39–3:39 PM | 73 |
| Fri Nov 6 🌘 | 8:27–10:27 AM 8:52–10:52 PM | 2:43–4:43 AM 1:59–3:59 PM | 83 |
| Sat Nov 7 🌘 | 9:12–11:12 AM 9:37–11:37 PM | 3:53–5:53 AM 2:21–4:21 PM | 91 |
| Sun Nov 8 🌘 | 9:58–11:58 AM 10:23–12:23 AM | 5:02–7:02 AM 2:47–4:47 PM | 97 |
| Mon Nov 9 🌑 | 10:46–12:46 PM 11:11–1:11 AM | 6:09–8:09 AM 3:16–5:16 PM | 99 |
Predictions & observations: NOAA CO-OPS station 8423745. Solunar windows computed from the moon's position for this location. Times shown in the station's local time. Not for navigation.
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