Tides Today & Tomorrow in Block Island, RI

TIDE TIMES for Monday, August 17, 2026
The tide is currently falling in Block Island, RI.
Next low tide : in 1h 47m at 5:50 pm (0.5 ft)
Next high tide : 11:58 pm (2.7 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 - Jan 1932

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri12:583.01:132.57:280.27:14-0.17:114:27Third Quarter1Fri
2Sat2:003.12:192.38:510.18:18-0.17:114:28Third Quarter2Sat
3Sun3:063.23:302.310:000.09:27-0.17:124:29Waning Crescent3Sun
4Mon4:113.34:352.410:59-0.110:30-0.27:124:30Waning Crescent4Mon
5Tue5:103.45:322.611:52-0.311:27-0.37:124:30Waning Crescent5Tue
6Wed6:033.56:242.712:42-0.37:124:31New Moon6Wed
7Thu6:533.57:122.812:19-0.41:27-0.47:124:32New Moon7Thu
8Fri7:403.47:592.81:08-0.42:09-0.47:114:33New Moon8Fri
9Sat8:243.38:432.81:52-0.32:46-0.37:114:34New Moon9Sat
10Sun9:063.19:262.72:31-0.23:20-0.37:114:35Waxing Crescent10Sun
11Mon9:462.910:092.63:08-0.13:50-0.17:114:36Waxing Crescent11Mon
12Tue10:252.710:522.53:440.14:180.07:114:37Waxing Crescent12Tue
13Wed11:052.411:342.44:260.34:490.17:104:38Waxing Crescent13Wed
14Thu11:472.25:180.45:260.27:104:40First Quarter14Thu
15Fri12:162.312:312.06:280.66:090.37:104:41First Quarter15Fri
16Sat1:002.31:201.87:560.66:570.47:094:42First Quarter16Sat
17Sun1:502.32:231.79:120.57:530.47:094:43First Quarter17Sun
18Mon2:542.33:351.810:130.48:560.37:084:44Waxing Gibbous18Mon
19Tue4:012.54:341.911:040.310:000.27:084:45Waxing Gibbous19Tue
20Wed4:552.75:212.111:500.110:550.07:074:46Waxing Gibbous20Wed
21Thu5:412.96:052.312:32-0.17:074:48Waxing Gibbous21Thu
22Fri6:243.16:482.51:12-0.27:064:49Full Moon22Fri
23Sat7:073.37:312.812:32-0.41:48-0.47:054:50Full Moon23Sat
24Sun7:503.48:162.91:18-0.52:21-0.57:054:51Full Moon24Sun
25Mon8:333.39:023.12:04-0.62:53-0.57:044:52Waning Gibbous25Mon
26Tue9:183.29:493.12:51-0.53:26-0.57:034:54Waning Gibbous26Tue
27Wed10:053.010:403.23:40-0.44:02-0.57:024:55Waning Gibbous27Wed
28Thu10:562.811:343.14:36-0.24:45-0.47:014:56Third Quarter28Thu
29Fri11:512.55:470.05:34-0.27:014:57Third Quarter29Fri
30Sat12:323.112:512.37:150.16:34-0.17:004:59Third Quarter30Sat
31Sun1:353.01:582.18:380.17:470.06:595:00Third Quarter31Sun
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 8:54 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