TidalMap

Block Island (Old Harbor) Tide Times

Rhode Island · Station 8459338 · Updated Sep 20, 2026

Block Island (Old Harbor) runs a mean tidal range of about 2.8 ft. This month the highest water, 3.8 ft, comes on the morning of Sep 28, and the lowest, a -0.2 ft minus tide, on the morning of Sep 11.

Nearest gauge measuring live water level: Montauk, Fort Pond Bay (8510560), about 23 mi away, high and low tides here run on average about 103 min earlier.

Predictedno live gauge

Next high tide 2.1 ft at 3:01 AM

Predicted

Today's tides
High tide	3:01 AM	2.1 ft
Low tide	8:37 AM	1.0 ft
High tide	3:57 PM	2.6 ft
Low tide	10:41 PM	0.9 ft

Monthly tide calendar

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

🌊 Biggest flood tides at Block Island (Old Harbor) this month: Sep 8, Sep 9, Sep 10, Sep 11, Sep 12, Sep 13, Sep 14, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30. 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 Block Island (Old Harbor) this month: Sep 1, Sep 9, Sep 10, Sep 11, Sep 12, Sep 13, Sep 27, Sep 28, Sep 29, Sep 30. These drain the flats and expose the oyster rock, prime for sight-fishing and clamming.

September 2026

Sun

Mon

Tue

Wed

Thu

Fri

Sat

1L:-0.0H:3.5L:0.4H:2.9

2L:0.1H:3.5L:0.5

3🌗H:2.8L:0.2H:3.4L:0.6

4🌗H:2.6L:0.3H:3.3L:0.6

5🌗H:2.6L:0.4H:3.2L:0.5

6🌗H:2.7L:0.4H:3.3L:0.3

7H:2.9L:0.2H:3.4

8L:0.2H:3.1L:0.0H:3.6

9L:-0.0H:3.4L:-0.1H:3.7

10L:-0.1H:3.7L:-0.2H:3.7

11🌑L:-0.2H:3.8L:-0.2H:3.6

12🌑L:-0.2H:3.8L:-0.1H:3.4

13🌑L:-0.1H:3.7L:0.1H:3.2

14L:0.0H:3.5L:0.3H:2.9

15L:0.2H:3.3L:0.5H:2.7

16L:0.4H:3.0L:0.7

17H:2.4L:0.7H:2.8L:0.9

18🌓H:2.3L:0.8H:2.6L:1.0

19🌓H:2.1L:1.0H:2.5L:1.0

20🌓H:2.1L:1.0H:2.6L:0.9

21🌓H:2.2L:0.9H:2.7L:0.7

22H:2.4L:0.7H:2.9

23L:0.5H:2.7L:0.5H:3.0

24L:0.4H:3.0L:0.3H:3.2

25🌕L:0.2H:3.3L:0.1H:3.3

26🌕L:0.0H:3.5L:0.0H:3.3

27🌕L:-0.1H:3.7L:-0.0H:3.3

28🌕L:-0.2H:3.8L:-0.0H:3.2

29L:-0.2H:3.8L:0.1H:3.1

30L:-0.1H:3.7L:0.2H:2.9

Best fishing times (solunar)

Major and minor solunar windows for Block Island (Old Harbor), 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 🌓	7:22–9:22 PM 7:47–9:47 AM	2:50–4:50 PM —	54
Mon Sep 21 🌓	8:09–10:09 PM 8:34–10:34 AM	3:23–5:23 PM 11:59–1:59 AM	67
Tue Sep 22 🌔	8:55–10:55 PM 9:20–11:20 AM	3:51–5:51 PM 1:03–3:03 AM	77
Wed Sep 23 🌔	9:39–11:39 PM 10:04–12:04 PM	4:15–6:15 PM 2:08–4:08 AM	86
Thu Sep 24 🌔	10:23–12:23 AM 10:48–12:48 PM	4:37–6:37 PM 3:13–5:13 AM	93
Fri Sep 25 🌕	— —	4:58–6:58 PM 4:19–6:19 AM	96
Sat Sep 26 🌕	11:06–1:06 AM 11:31–1:31 PM	5:21–7:21 PM 5:26–7:26 AM	97

Predictions & observations: NOAA CO-OPS station 8459338. 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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