NOAA station 8459338
Block Island (Old Harbor), RI
Tide now1.0 ft↓ falling · predicted
Next high9:38 AM2.9 ft
Next low2:41 AM0.4 ft
No active NWS marine or coastal alerts here
Times EST · NOAA source
Tide charts › RI
Block Island (Old Harbor), RI tide chart and marine alerts
NOAA station 8459338 · 41.173°N, 71.557°W. Get an email only when the NWS issues a marine or coastal alert here, or the tide runs unusually high or low.
Today and tomorrow
Next 7 days Shape drawn between NOAA's predicted highs and lows
7-day tides, sun and moon Times EST · feet above MLLW
| Day | High tides | Low tides | Sunrise Sunset | Moon |
|---|---|---|---|---|
| Fri, Nov 13 | 9:38 AM 2.9 ft10:03 PM 2.3 ft | 2:41 AM 0.4 ft3:44 PM 0.5 ft | 6:31 AM 4:30 PM | Waxing crescent 18% |
| Sat, Nov 14 | 10:20 AM 2.7 ft10:50 PM 2.2 ft | 3:21 AM 0.6 ft4:32 PM 0.6 ft | 6:32 AM 4:29 PM | Waxing crescent 25% |
| Sun, Nov 15 | 11:08 AM 2.6 ft11:42 PM 2.2 ft | 4:06 AM 0.7 ft5:40 PM 0.7 ft | 6:33 AM 4:28 PM | Waxing crescent 34% |
| Mon, Nov 16 | 12:00 PM 2.5 ft | 5:02 AM 0.8 ft6:53 PM 0.7 ft | 6:34 AM 4:27 PM | Waxing crescent 43% |
| Tue, Nov 17 | 12:36 AM 2.2 ft12:53 PM 2.4 ft | 6:17 AM 0.9 ft7:44 PM 0.6 ft | 6:35 AM 4:26 PM | First quarter 53% |
| Wed, Nov 18 | 1:31 AM 2.3 ft1:50 PM 2.4 ft | 7:54 AM 0.8 ft8:26 PM 0.5 ft | 6:37 AM 4:25 PM | Waxing gibbous 63% |
| Thu, Nov 19 | — | — | 6:38 AM 4:25 PM | Waxing gibbous 73% |
Tides: NOAA CO-OPS predictions. Sun and moon: computed for this station's coordinates with NOAA's solar equations and standard lunar formulas.
Today Friday, Nov 13
| Tide | Time (EST) | Height |
|---|---|---|
| Low | 2:41 AM | 0.4 ft |
| High | 9:38 AM | 2.9 ft |
| Low | 3:44 PM | 0.5 ft |
| High | 10:03 PM | 2.3 ft |
Tomorrow Saturday, Nov 14
| Tide | Time (EST) | Height |
|---|---|---|
| Low | 3:21 AM | 0.6 ft |
| High | 10:20 AM | 2.7 ft |
| Low | 4:32 PM | 0.6 ft |
| High | 10:50 PM | 2.2 ft |
Sunday Sunday, Nov 15
| Tide | Time (EST) | Height |
|---|---|---|
| Low | 4:06 AM | 0.7 ft |
| High | 11:08 AM | 2.6 ft |
| Low | 5:40 PM | 0.7 ft |
| High | 11:42 PM | 2.2 ft |
Active NWS alerts
No active NWS marine or coastal alerts cover this station right now (checked 12:57 AM EST).
Marine forecast ANZ237 · Block Island Sound
- Overnight
- NE winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 5 seconds and SW 1 foot at 4 seconds. Rain.
- Fri
- NE winds 20 to 25 kt, becoming N 15 to 20 kt in the afternoon. Gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: NE 5 ft at 6 seconds and S 3 ft at 8 seconds. Rain.
- Fri Night
- N winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: NE 4 ft at 5 seconds and S 3 ft at 9 seconds. A chance of rain in the evening.
- Sat
- NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 3 seconds and NE 2 ft at 6 seconds.
- Sat Night through Sun Night
- NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and E 1 foot at 5 seconds.
- Mon through Tue Night
- W winds 10 to 15 kt. Seas around 2 ft. Wave Detail: NW 2 ft at 3 seconds and NE 1 foot at 6 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.
National Weather Service, issued Thu 10:03 PM EST. Official forecast for ANZ237
Unusual tides here
We flag a predicted high at or above 4.9 ft MLLW (0.5 m above mean higher high water (MHHW), NOAA's national proxy for minor high-tide flooding, because NOAA lists no station threshold). We flag a predicted low at or below −1.0 ft MLLW. Mean higher high water is 3.2 ft.
No predicted tide in the next few days crosses either line.
Official sources
- NOAA station home page
- NOAA tide predictions
- NWS forecast and hazards for this point
- NWS marine forecast, zone ANZ237
Predictions are astronomical tides. Wind and pressure can move the real water level a foot or more.
Nearby stations
- Montauk, NY 23 mi
- Newport, RI 26 mi
- New London, CT 31 mi
- Penikese Island, MA 38 mi
- Greenport, NY 42 mi
- Providence, RI 45 mi
Put this tide widget on your site
Free for club, marina, and charter sites: a small, script-free card with the next high and low and any active NWS alert, linking back here. Copy:
<iframe src="https://salttidings.com/embed/block-island-ri" title="Block Island (Old Harbor), RI tides" width="320" height="230" style="border:0" loading="lazy"></iframe>Block Island (Old Harbor), RI: common questions
When is the next high tide at Block Island (Old Harbor), RI?
NOAA predicts the next high tide at Block Island (Old Harbor), RI at Fri 9:38 AM EST, 2.9 ft above mean lower low water (MLLW).
When is the next low tide at Block Island (Old Harbor), RI?
The next predicted low tide is at Fri 2:41 AM EST, 0.4 ft relative to MLLW.
Is there a marine alert for Block Island (Old Harbor), RI right now?
No. When this page was built, no NWS marine or coastal alert covered this station.
What are these tide heights measured from?
Heights are in feet above mean lower low water (MLLW), the average of the lower of the two daily low tides. A negative number means the water is below that average.
How do I get an email when something happens at Block Island (Old Harbor), RI?
Enter your email at the top of this page. You get one confirmation email, then nothing until the NWS issues a marine or coastal alert here or the tide is predicted unusually high or low. Unsubscribe in one click.