Tides Today & Tomorrow in Block Island, RI

TIDE TIMES for Sunday, August 16, 2026
The tide is currently rising in Block Island, RI.
Next low tide : 5:02 pm (0.2 ft)
Next high tide : in 5h 59m at 11:00 am (3.6 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 - Jun 1934

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri11:063.111:333.65:09-0.24:48-0.15:158:12Waning Gibbous1Fri
2Sat12:043.16:06-0.15:590.15:158:12Waning Gibbous2Sat
3Sun12:313.41:043.17:060.07:280.35:148:13Third Quarter3Sun
4Mon1:293.12:043.28:010.18:470.35:148:14Third Quarter4Mon
5Tue2:272.93:053.28:530.19:570.45:148:14Third Quarter5Tue
6Wed3:292.74:093.39:430.211:000.45:138:15Waning Crescent6Wed
7Thu4:322.65:083.310:300.211:550.35:138:16Waning Crescent7Thu
8Fri5:302.56:013.411:150.25:138:16Waning Crescent8Fri
9Sat6:222.66:483.412:440.311:57 AM0.25:138:17Waning Crescent9Sat
10Sun7:092.67:323.31:290.312:370.25:138:18New Moon10Sun
11Mon7:542.78:143.32:110.21:180.25:128:18New Moon11Mon
12Tue8:372.78:533.22:500.21:580.35:128:19New Moon12Tue
13Wed9:182.79:303.13:260.22:380.35:128:19New Moon13Wed
14Thu9:592.710:063.04:010.33:170.45:128:19Waxing Crescent14Thu
15Fri10:392.610:412.94:350.33:570.55:128:20Waxing Crescent15Fri
16Sat11:202.611:182.85:080.44:380.65:128:20Waxing Crescent16Sat
17Sun12:012.55:410.55:240.75:128:21Waxing Crescent17Sun
18Mon12:442.66:150.56:180.85:128:21First Quarter18Mon
19Tue12:412.61:272.66:520.57:210.85:128:21First Quarter19Tue
20Wed1:272.52:132.87:330.58:290.85:138:22First Quarter20Wed
21Thu2:192.43:052.98:190.49:420.65:138:22First Quarter21Thu
22Fri3:182.44:033.19:100.410:500.55:138:22Waxing Gibbous22Fri
23Sat4:242.45:033.410:070.311:480.35:138:22Waxing Gibbous23Sat
24Sun5:272.65:593.611:060.15:148:22Waxing Gibbous24Sun
25Mon6:242.86:533.912:420.112:03-0.15:148:23Full Moon25Mon
26Tue7:183.07:474.01:35-0.112:59-0.25:148:23Full Moon26Tue
27Wed8:123.28:404.12:27-0.31:57-0.35:158:23Full Moon27Wed
28Thu9:053.39:324.13:16-0.42:54-0.35:158:23Full Moon28Thu
29Fri9:573.410:233.94:03-0.43:51-0.35:158:23Waning Gibbous29Fri
30Sat10:513.511:163.74:50-0.34:50-0.15:168:23Waning Gibbous30Sat
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 2:01 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