Nearby Harbors
41.1867’ N, 71.5783’ W

Block Island, RI

61°
H 65°
L 58°
NNE
16mph
Low tide
10:20 am
Photo Credits

Tides Today & Tomorrow in Block Island, RI

TIDE TIMES for Monday, September 21, 2026
The tide is currently falling in Block Island, RI.
Next low tide : in 4h 26m at 10:20 am (0.9 ft)
Next high tide : 5:00 pm (2.7 ft)
Sunset today : 6:45 pm
Sunrise tomorrow : 6:33 am
Moon phase : Waxing Gibbous (75% illuminated)
Tide Station Location : Station #8459338
Common Questions About Tides

Featured Local Businesses

Champlins Marina Resort, docks filled on a sunny summer day

Champlin's Marina & Resort
New Harbor Great Salt Pond Block Island Aerial

New Shoreham (Block Island) Harbormaster
Coast Guard Station, Point Judith Rhode Island,

USCG Station Point Judith, RI
Beach in East Hampton, NY -- Nicole Mayone, CC BY-SA 2.0 , via Wikimedia Commons

East Hampton Harbormaster

Block Island, RI Tides - Dec 1857

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue6:504.17:203.212:07-0.61:31-0.66:564:22Full Moon1Tue
2Wed7:424.18:123.112:58-0.62:22-0.56:574:22Full Moon2Wed
3Thu8:354.09:043.11:49-0.53:14-0.46:584:22Waning Gibbous3Thu
4Fri9:283.79:583.02:41-0.44:08-0.26:594:21Waning Gibbous4Fri
5Sat10:243.410:562.83:36-0.25:090.07:004:21Waning Gibbous5Sat
6Sun11:233.111:572.84:410.16:110.17:014:21Third Quarter6Sun
7Mon12:222.86:090.37:090.27:024:21Third Quarter7Mon
8Tue12:582.71:202.57:280.48:000.37:034:21Third Quarter8Tue
9Wed1:592.72:202.38:360.58:470.37:044:21Third Quarter9Wed
10Thu3:002.73:202.29:360.59:280.37:054:21Waning Crescent10Thu
11Fri3:562.84:142.210:260.410:050.37:064:21Waning Crescent11Fri
12Sat4:432.95:002.211:090.310:390.37:064:21Waning Crescent12Sat
13Sun5:253.05:412.311:490.211:120.27:074:22Waning Crescent13Sun
14Mon6:033.06:192.312:270.17:084:22New Moon14Mon
15Tue6:393.06:552.41:050.17:094:22New Moon15Tue
16Wed7:143.07:312.412:240.11:410.07:094:22New Moon16Wed
17Thu7:493.08:072.41:010.12:160.17:104:23New Moon17Thu
18Fri8:253.08:452.41:390.12:490.17:114:23Waxing Crescent18Fri
19Sat9:022.99:252.42:170.13:200.17:114:23Waxing Crescent19Sat
20Sun9:422.810:092.42:560.23:530.27:124:24Waxing Crescent20Sun
21Mon10:262.710:582.43:390.34:310.27:124:24Waxing Crescent21Mon
22Tue11:142.611:502.54:290.45:160.17:134:25First Quarter22Tue
23Wed12:072.55:320.46:070.17:134:25First Quarter23Wed
24Thu12:442.61:042.46:500.47:010.07:144:26First Quarter24Thu
25Fri1:422.82:072.48:240.37:59-0.17:144:27First Quarter25Fri
26Sat2:453.03:162.49:430.19:00-0.27:144:27Waxing Gibbous26Sat
27Sun3:503.34:222.510:44-0.110:02-0.37:154:28Waxing Gibbous27Sun
28Mon4:503.55:212.711:40-0.311:01-0.57:154:29Waxing Gibbous28Mon
29Tue5:463.76:152.912:33-0.57:154:29Full Moon29Tue
30Wed6:403.87:073.01:25-0.67:154:30Full Moon30Wed
31Thu7:333.87:583.112:53-0.72:13-0.67:164:31Full Moon31Thu
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8459338)

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Common Questions About Block Island, RI Tides

Collapse All
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 75% 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 (75% 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

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