Tides Today & Tomorrow in Nantucket, MA

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently falling in Nantucket, MA.
Next low tide : in 17m at 10:43 am (0.6 ft)
Next high tide : 5:24 pm (3.6 ft)
Sunset today : 7:35 pm
Sunrise tomorrow : 5:52 am
Moon phase : First Quarter (36% illuminated)
Tide Station Location : Station #8449130
Common Questions About Tides

Nantucket, MA Tides - Aug 1942

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sat4:203.74:553.610:090.010:360.25:357:58Waning Gibbous1Sat
2Sun5:153.45:463.611:000.211:340.35:367:57Third Quarter2Sun
3Mon6:103.26:373.511:510.45:367:55Third Quarter3Mon
4Tue7:043.07:273.512:310.412:410.65:377:54Third Quarter4Tue
5Wed8:002.88:183.51:280.51:320.75:387:53Third Quarter5Wed
6Thu8:552.89:093.52:260.52:240.85:397:52Waning Crescent6Thu
7Fri9:482.79:573.53:220.53:160.85:407:51Waning Crescent7Fri
8Sat10:362.710:423.54:120.54:040.85:417:49Waning Crescent8Sat
9Sun11:212.711:263.54:560.54:490.85:427:48Waning Crescent9Sun
10Mon12:052.85:360.45:310.85:437:47New Moon10Mon
11Tue12:103.612:472.96:140.46:120.75:447:46New Moon11Tue
12Wed12:523.61:273.06:520.36:530.65:457:44New Moon12Wed
13Thu1:343.62:063.17:290.37:340.65:477:43New Moon13Thu
14Fri2:143.62:443.28:070.38:180.55:487:41Waxing Crescent14Fri
15Sat2:563.53:243.38:460.29:040.45:497:40Waxing Crescent15Sat
16Sun3:393.44:073.59:290.29:540.35:507:39Waxing Crescent16Sun
17Mon4:273.34:543.610:140.210:480.25:517:37Waxing Crescent17Mon
18Tue5:203.25:443.711:030.211:440.25:527:36First Quarter18Tue
19Wed6:163.26:383.811:550.35:537:34First Quarter19Wed
20Thu7:153.17:363.912:410.112:500.35:547:33First Quarter20Thu
21Fri8:173.18:364.01:410.01:490.35:557:31Waxing Gibbous21Fri
22Sat9:193.19:374.12:430.02:500.25:567:30Waxing Gibbous22Sat
23Sun10:203.210:354.23:43-0.13:500.15:577:28Waxing Gibbous23Sun
24Mon11:183.311:344.24:40-0.24:470.15:587:27Full Moon24Mon
25Tue12:143.45:33-0.25:430.05:597:25Full Moon25Tue
26Wed12:314.21:083.56:24-0.26:370.06:007:24Full Moon26Wed
27Thu1:254.11:583.67:13-0.17:300.06:017:22Full Moon27Thu
28Fri2:173.92:453.78:010.08:220.06:027:21Waning Gibbous28Fri
29Sat3:063.73:313.78:480.19:140.16:037:19Waning Gibbous29Sat
30Sun3:553.54:173.69:350.310:080.26:047:17Waning Gibbous30Sun
31Mon4:463.35:053.610:240.511:020.36:057:16Third Quarter31Mon
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8449130)

Common Questions About Nantucket, MA Tides

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What time does the tide turn (slack tide) in Nantucket, MA today?

Slack tide in Nantucket, MA is approximately 2:03 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 Nantucket, MA?

Nantucket, MA is currently in a transitional phase. Tonight's moon is 36% 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 Nantucket, MA 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 Nantucket, MA?

Tide predictions for Nantucket, MA 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 Nantucket, MA?

Tide data for Nantucket, MA is sourced from NOAA Station #8449130. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8449130.

What is the moon phase in Nantucket, MA tonight?

Tonight the moon over Nantucket, MA is First Quarter (36% illuminated). This places Nantucket, MA 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