Tides Today & Tomorrow in Block Island, RI

TIDE TIMES for Saturday, August 22, 2026
The tide is currently falling in Block Island, RI.
Next low tide : in 3h 21m at 9:04 am (0.9 ft)
Next high tide : 4:38 pm (2.7 ft)
Sunset today : 7:35 pm
Sunrise tomorrow : 6:03 am
Moon phase : Waxing Gibbous (73% illuminated)
Tide Station Location : Station #8459338
Common Questions About Tides

Block Island, RI Tides - Feb 1922

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed10:002.510:202.53:250.13:46-0.16:575:02Waxing Crescent1Wed
2Thu10:382.411:002.44:030.24:210.06:565:03Waxing Crescent2Thu
3Fri11:222.211:452.44:480.35:040.16:555:04First Quarter3Fri
4Sat12:112.15:430.45:530.26:545:05First Quarter4Sat
5Sun12:362.41:072.06:520.56:500.26:535:07First Quarter5Sun
6Mon1:352.52:122.18:430.47:540.16:525:08First Quarter6Mon
7Tue2:432.63:232.29:590.29:06-0.16:515:09Waxing Gibbous7Tue
8Wed3:532.94:282.510:53-0.110:16-0.36:505:10Waxing Gibbous8Wed
9Thu4:543.25:242.811:41-0.411:16-0.66:495:12Waxing Gibbous9Thu
10Fri5:483.46:153.112:26-0.66:485:13Full Moon10Fri
11Sat6:383.77:063.412:12-0.81:10-0.86:465:14Full Moon11Sat
12Sun7:283.87:553.61:06-0.91:53-0.96:455:15Full Moon12Sun
13Mon8:173.78:443.71:57-1.02:34-0.96:445:17Waning Gibbous13Mon
14Tue9:063.69:353.62:48-0.93:14-0.96:425:18Waning Gibbous14Tue
15Wed9:563.310:273.53:39-0.73:55-0.76:415:19Waning Gibbous15Wed
16Thu10:483.011:233.34:37-0.54:41-0.46:405:20Waning Gibbous16Thu
17Fri11:442.75:50-0.25:35-0.26:385:22Third Quarter17Fri
18Sat12:223.012:432.47:070.06:500.06:375:23Third Quarter18Sat
19Sun1:252.81:482.28:200.28:140.26:365:24Third Quarter19Sun
20Mon2:362.63:002.19:260.29:270.26:345:25Waning Crescent20Mon
21Tue3:462.64:082.210:230.210:260.26:335:26Waning Crescent21Tue
22Wed4:442.65:022.311:110.111:140.16:315:28Waning Crescent22Wed
23Thu5:332.75:482.511:520.011:560.06:305:29Waning Crescent23Thu
24Fri6:142.86:282.612:28-0.16:295:30Waning Crescent24Fri
25Sat6:512.97:052.712:33-0.11:01-0.26:275:31New Moon25Sat
26Sun7:252.97:382.81:07-0.21:29-0.36:265:32New Moon26Sun
27Mon7:562.98:092.81:39-0.21:54-0.36:245:34New Moon27Mon
28Tue8:262.88:392.82:07-0.22:17-0.36:235:35New Moon28Tue
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 12:51 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 transitional phase. Tonight's moon is 73% 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 shifting between spring and neap.

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 Gibbous (73% illuminated). This places Block Island, RI in a transitional tide cycle, so tidal ranges are shifting between spring and neap 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