Tides Today & Tomorrow in Block Island, RI

TIDE TIMES for Sunday, August 16, 2026
The tide is currently falling in Block Island, RI.
Next low tide : in 5h 08m at 5:02 pm (0.2 ft)
Next high tide : 11:14 pm (3.1 ft)
Sunset today : 7:44 pm
Sunrise tomorrow : 5:57 am
Moon phase : Waxing Crescent (18% illuminated)
Tide Station Location : Station #8459338
Common Questions About Tides

Block Island, RI Tides - Feb 1934

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu8:222.88:472.72:01-0.22:37-0.26:575:02Full Moon1Thu
2Fri8:542.89:232.72:34-0.22:57-0.26:565:03Waning Gibbous2Fri
3Sat9:302.610:012.83:09-0.13:23-0.26:555:04Waning Gibbous3Sat
4Sun10:102.510:442.83:480.03:55-0.26:545:06Waning Gibbous4Sun
5Mon10:562.311:322.84:330.14:36-0.16:535:07Third Quarter5Mon
6Tue11:492.25:290.25:250.06:525:08Third Quarter6Tue
7Wed12:262.712:482.16:400.36:250.06:515:09Third Quarter7Wed
8Thu1:292.81:562.18:210.27:360.06:505:11Third Quarter8Thu
9Fri2:422.83:132.29:480.19:01-0.16:495:12Waning Crescent9Fri
10Sat3:583.04:252.410:49-0.210:25-0.36:475:13Waning Crescent10Sat
11Sun5:023.35:252.811:42-0.411:30-0.56:465:14Waning Crescent11Sun
12Mon5:573.56:183.112:30-0.66:455:15New Moon12Mon
13Tue6:473.67:083.312:27-0.71:14-0.86:445:17New Moon13Tue
14Wed7:353.67:563.51:20-0.81:54-0.96:425:18New Moon14Wed
15Thu8:213.58:423.52:09-0.82:30-0.86:415:19Waxing Crescent15Thu
16Fri9:053.39:283.42:55-0.73:03-0.76:405:20Waxing Crescent16Fri
17Sat9:503.010:143.23:40-0.53:34-0.56:385:22Waxing Crescent17Sat
18Sun10:362.611:012.94:28-0.24:05-0.36:375:23Waxing Crescent18Sun
19Mon11:242.311:512.75:240.14:410.06:365:24First Quarter19Mon
20Tue12:162.06:370.45:250.26:345:25First Quarter20Tue
21Wed12:452.41:131.87:530.56:200.46:335:26First Quarter21Wed
22Thu1:522.22:261.79:050.67:330.56:315:28First Quarter22Thu
23Fri3:182.23:431.810:060.59:230.56:305:29Waxing Gibbous23Fri
24Sat4:252.24:412.010:550.410:270.36:285:30Waxing Gibbous24Sat
25Sun5:142.45:262.211:360.311:150.26:275:31Waxing Gibbous25Sun
26Mon5:522.66:042.412:130.16:255:32Waxing Gibbous26Mon
27Tue6:242.76:382.612:46-0.16:245:34Full Moon27Tue
28Wed6:542.87:112.812:36-0.21:15-0.26:225:35Full Moon28Wed
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8459338)

Common Questions About Block Island, RI Tides

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What time does the tide turn (slack tide) in Block Island, RI today?

Slack tide in Block Island, RI is approximately 8:08 pm — midway between the next high and low tide, when tidal current is weakest. This is the preferred window for boat crossings, underwater visibility, and fishing in areas with strong currents.

Is this week a spring tide or neap tide in Block Island, RI?

Block Island, RI is currently in a spring phase. Tonight's moon is 18% illuminated. Spring tides (largest swings) occur near new and full moons; neap tides (smallest swings) occur near first and third quarter moons. Tidal ranges this week are near their weekly maximum.

What datum are Block Island, RI tide heights measured from?

Tide heights on this page are measured from Mean Lower Low Water (MLLW), the U.S. NOAA standard. A height of 0 ft represents the 19-year average of each day's lower low tide. Negative values indicate a "minus tide" — water levels below that long-term reference.

What factors can affect the tide predictions for Block Island, RI?

Tide predictions for Block Island, RI come from NOAA's harmonic analysis and are typically accurate within about ±10 minutes on timing and ±0.5 ft on height. Actual water levels can deviate further due to sustained winds, atmospheric pressure changes, river flow, and storm surge. During major weather events, be sure to check US Harbors weather pages for factors that could impact tidal predictions.

Which NOAA station provides tide data for Block Island, RI?

Tide data for Block Island, RI is sourced from NOAA Station #8459338. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8459338.

What is the moon phase in Block Island, RI tonight?

Tonight the moon over Block Island, RI is Waxing Crescent (18% illuminated). This places Block Island, RI in a spring tide cycle, so tidal ranges are near their weekly maximum this week.

US Harbors Tidal Data

The data in our tide charts, tide tables, and tide graphs is provided by NOAA and others. These predictions are derived mathematically from numerous inputs, including data from historical tide stations and nearby locations where sensors are actively recording. As shown in the tide graph at the top of this page, “Predicted” tides (blue) are what forecasting models expect to happen. “Observed” tides (red) are those recorded by local sensors in real time, overlaid on the predictions for direct comparison. We display Observed water levels for a select group of harbors including Portland, Maine, where a physical sensor monitors water levels in real time.

LEARN MORE ABOUT OUR TIDE DATA