Tides Today & Tomorrow in Block Island, RI

TIDE TIMES for Thursday, August 20, 2026
The tide is currently rising in Block Island, RI.
Next low tide (tomorrow) : 7:49 am (0.9 ft)
Next high tide (tomorrow) : in 4h 02m at 2:30 am (2.1 ft)
Sunset today : 7:38 pm
Sunrise tomorrow : 6:01 am
Moon phase : First Quarter (55% illuminated)
Tide Station Location : Station #8459338
Common Questions About Tides

Block Island, RI Tides - Jun 1924

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun7:452.77:593.31:530.21:090.25:158:12New Moon1Sun
2Mon8:222.78:323.32:300.21:440.25:158:13New Moon2Mon
3Tue8:592.79:053.23:050.22:210.25:148:13New Moon3Tue
4Wed9:352.79:393.23:380.22:580.25:148:14New Moon4Wed
5Thu10:132.610:163.14:080.33:360.35:148:15Waxing Crescent5Thu
6Fri10:532.610:563.04:380.34:160.45:138:15Waxing Crescent6Fri
7Sat11:372.611:402.95:110.45:000.55:138:16Waxing Crescent7Sat
8Sun12:252.65:520.45:510.65:138:17Waxing Crescent8Sun
9Mon12:292.81:152.76:410.46:510.65:138:17First Quarter9Mon
10Tue1:222.82:082.87:340.48:000.65:128:18First Quarter10Tue
11Wed2:182.83:063.08:290.39:170.55:128:18First Quarter11Wed
12Thu3:212.84:083.39:270.210:360.35:128:19Waxing Gibbous12Thu
13Fri4:282.95:093.610:270.011:400.05:128:19Waxing Gibbous13Fri
14Sat5:313.06:053.911:23-0.25:128:20Waxing Gibbous14Sat
15Sun6:293.26:594.112:38-0.212:18-0.35:128:20Full Moon15Sun
16Mon7:243.37:524.31:33-0.41:12-0.45:128:20Full Moon16Mon
17Tue8:183.48:454.32:27-0.52:06-0.55:128:21Full Moon17Tue
18Wed9:113.59:374.23:19-0.53:01-0.45:128:21Full Moon18Wed
19Thu10:043.410:294.04:09-0.53:54-0.35:128:21Waning Gibbous19Thu
20Fri10:573.411:233.75:00-0.34:50-0.15:138:22Waning Gibbous20Fri
21Sat11:533.25:54-0.15:570.25:138:22Waning Gibbous21Sat
22Sun12:183.412:503.16:500.07:140.45:138:22Third Quarter22Sun
23Mon1:133.11:463.07:430.28:230.55:138:22Third Quarter23Mon
24Tue2:082.82:442.98:320.39:270.65:148:22Third Quarter24Tue
25Wed3:042.63:442.99:180.410:260.65:148:23Third Quarter25Wed
26Thu4:042.54:422.910:010.511:180.65:148:23Waning Crescent26Thu
27Fri5:022.45:333.010:420.55:158:23Waning Crescent27Fri
28Sat5:522.56:183.012:040.611:21 AM0.55:158:23Waning Crescent28Sat
29Sun6:362.56:573.112:470.512:000.45:168:23Waning Crescent29Sun
30Mon7:172.67:333.21:290.412:400.35:168:23New Moon30Mon
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 5:09 am — 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 neap phase. Tonight's moon is 55% 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 minimum.

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 First Quarter (55% illuminated). This places Block Island, RI in a neap tide cycle, so tidal ranges are near their weekly minimum 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