Tides Today & Tomorrow in Block Island, RI

TIDE TIMES for Monday, August 17, 2026
The tide is currently rising in Block Island, RI.
Next low tide : 5:50 pm (0.5 ft)
Next high tide : in 1h 19m at 11:46 am (3.4 ft)
Sunset today : 7:42 pm
Sunrise tomorrow : 5:58 am
Moon phase : Waxing Crescent (27% illuminated)
Tide Station Location : Station #8459338
Common Questions About Tides

Block Island, RI Tides - Jun 1932

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed6:272.46:433.112:380.411:48 AM0.45:158:12Waning Crescent1Wed
2Thu7:062.47:183.21:190.412:260.35:158:13New Moon2Thu
3Fri7:442.57:533.21:590.31:050.35:148:13New Moon3Fri
4Sat8:222.68:303.22:390.21:450.25:148:14New Moon4Sat
5Sun9:002.69:093.23:160.22:260.25:148:15New Moon5Sun
6Mon9:402.69:493.23:510.33:070.35:138:15Waxing Crescent6Mon
7Tue10:232.610:323.14:250.33:490.35:138:16Waxing Crescent7Tue
8Wed11:092.611:183.14:590.44:350.45:138:17Waxing Crescent8Wed
9Thu12:002.75:400.45:270.55:138:17Waxing Crescent9Thu
10Fri12:083.012:532.86:270.36:300.55:128:18First Quarter10Fri
11Sat1:012.91:482.97:170.37:440.55:128:18First Quarter11Sat
12Sun1:572.82:453.18:090.29:060.55:128:19First Quarter12Sun
13Mon2:582.83:463.49:020.110:240.35:128:19Waxing Gibbous13Mon
14Tue4:052.74:483.610:000.011:300.15:128:20Waxing Gibbous14Tue
15Wed5:112.85:473.810:58-0.15:128:20Waxing Gibbous15Wed
16Thu6:122.96:424.012:28-0.111:54 AM-0.15:128:21Waxing Gibbous16Thu
17Fri7:083.07:364.01:24-0.212:50-0.25:128:21Full Moon17Fri
18Sat8:013.18:294.02:17-0.31:46-0.25:128:21Full Moon18Sat
19Sun8:543.19:213.93:08-0.32:41-0.25:138:21Full Moon19Sun
20Mon9:453.110:113.73:55-0.23:33-0.15:138:22Waning Gibbous20Mon
21Tue10:353.111:003.54:41-0.14:230.15:138:22Waning Gibbous21Tue
22Wed11:273.011:503.25:270.15:160.35:138:22Waning Gibbous22Wed
23Thu12:192.96:130.26:190.55:138:22Waning Gibbous23Thu
24Fri12:382.91:112.86:560.37:280.75:148:22Third Quarter24Fri
25Sat1:252.72:002.87:340.48:310.85:148:23Third Quarter25Sat
26Sun2:122.42:492.88:070.59:310.85:148:23Third Quarter26Sun
27Mon3:022.33:412.88:420.610:290.85:158:23Third Quarter27Mon
28Tue4:002.24:362.89:250.611:210.75:158:23Waning Crescent28Tue
29Wed5:002.25:252.910:140.65:168:23Waning Crescent29Wed
30Thu5:512.26:093.012:090.611:05 AM0.55:168:23Waning Crescent30Thu
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 2:48 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 27% 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 Crescent (27% 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