TidalMap

Portsmouth Tide Times

New Hampshire · Station 8423745 · Updated Aug 5, 2026

Portsmouth runs a mean tidal range of about 7.7 ft. This month the highest water, 9.6 ft, comes on the evening of Aug 12, and the lowest, a -0.9 ft minus tide, on the morning of Aug 13.

Nearest gauge measuring live water level: Seavey Island (8419870), under a mile away — high and low tides here run on average about 3 min later.

Predictedno live gauge

Next high tide 8.5 ft at 4:55 PM

Predicted

Monthly tide calendar

Flood & low finder Flood tide ≥ ft Low tide ≤ ft

🌊 Biggest flood tides at Portsmouth this month: Aug 9, Aug 10, Aug 11, Aug 12, Aug 14, Aug 15. 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: Aug 10, Aug 11, Aug 12, Aug 13, Aug 14, Aug 15, Aug 16, Aug 29, Aug 30, Aug 31. These drain the flats and expose the oyster rock — prime for sight-fishing and clamming.

August 2026

Sun

Mon

Tue

Wed

Thu

Fri

Sat

1H:8.5L:0.0H:7.9L:0.7

2H:8.4L:0.0H:8.1L:0.5

3H:8.3L:0.1H:8.3L:0.4

4H:8.1L:0.2H:8.4L:0.4

5🌗H:7.8L:0.4H:8.5L:0.3

6🌗H:7.5L:0.6H:8.6

7🌗L:0.3H:7.3L:0.8H:8.7

8L:0.3H:7.2L:0.8H:8.8

9L:0.1H:7.3L:0.7H:9.0

10L:-0.2H:7.6L:0.5H:9.3

11L:-0.5H:7.9L:0.2H:9.5

12🌑L:-0.8H:8.2L:-0.1H:9.6

13🌑L:-0.9H:8.5L:-0.3

14🌑H:9.6L:-0.9H:8.7L:-0.3

15🌑H:9.3L:-0.7H:8.8L:-0.2

16H:8.9L:-0.3H:8.7L:-0.0

17H:8.4L:0.1H:8.5L:0.3

18H:7.9L:0.6H:8.2L:0.6

19🌓H:7.3L:1.1H:7.9L:0.9

20🌓H:6.9L:1.5H:7.7

21🌓L:1.2H:6.6L:1.8H:7.5

22🌓L:1.3H:6.5L:1.9H:7.5

23L:1.2H:6.5L:1.8H:7.7

24L:1.0H:6.7L:1.6H:7.9

25L:0.8H:7.0L:1.3H:8.1

26L:0.5H:7.3L:1.1H:8.4

27🌕L:0.3H:7.6L:0.8H:8.5

28🌕L:0.1H:7.9L:0.5

29🌕H:8.6L:-0.0H:8.2L:0.2

30H:8.6L:-0.1H:8.5L:0.0

31H:8.5L:-0.1H:8.7L:-0.1

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 🌗	4:53–6:53 AM 5:18–7:18 PM	10:06–12:06 AM 12:26–2:26 PM	34
Thu Aug 6 🌗	5:49–7:49 AM 6:14–8:14 PM	10:45–12:45 AM 1:45–3:45 PM	40
Fri Aug 7 🌗	6:49–8:49 AM 7:14–9:14 PM	— 3:03–5:03 PM	53
Sat Aug 8 🌘	7:52–9:52 AM 8:17–10:17 PM	11:34–1:34 AM 4:13–6:13 PM	66
Sun Aug 9 🌘	8:57–10:57 AM 9:22–11:22 PM	12:37–2:37 AM 5:12–7:12 PM	76
Mon Aug 10 🌘	10:00–12:00 PM 10:25–12:25 AM	1:50–3:50 AM 5:58–7:58 PM	85
Tue Aug 11 🌘	10:59–12:59 PM 11:24–1:24 AM	3:09–5:09 AM 6:34–8:34 PM	92

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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