Tides Today & Tomorrow in Onset Beach, MA

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently rising in Onset Beach, MA.
Next low tide (tomorrow) : 7:31 am (0.6 ft)
Next high tide (tomorrow) : in 1h 55m at 1:51 am (3.2 ft)
Sunset today : 7:38 pm
Sunrise tomorrow : 5:54 am
Moon phase : First Quarter (36% illuminated)
Tide Station Location : Station #8447277
Common Questions About Tides

Onset Beach, MA Tides - Sep 1930

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Mon3:453.04:253.69:431.06:077:17First Quarter1Mon
2Tue4:493.05:323.512:131.011:08 AM1.06:087:15Waxing Gibbous2Tue
3Wed5:543.06:323.512:570.912:130.96:097:14Waxing Gibbous3Wed
4Thu6:493.27:193.61:300.81:000.86:107:12Waxing Gibbous4Thu
5Fri7:343.47:593.71:590.71:410.66:117:10Waxing Gibbous5Fri
6Sat8:143.68:343.82:290.52:220.46:127:09Full Moon6Sat
7Sun8:503.79:063.93:000.43:030.36:147:07Full Moon7Sun
8Mon9:233.89:383.83:310.23:440.36:157:05Full Moon8Mon
9Tue9:563.910:113.84:030.24:230.26:167:04Full Moon9Tue
10Wed10:293.910:463.64:320.15:000.36:177:02Waning Gibbous10Wed
11Thu11:043.911:253.55:020.15:340.46:187:00Waning Gibbous11Thu
12Fri11:433.85:320.26:090.56:196:58Waning Gibbous12Fri
13Sat12:093.312:273.86:060.36:480.66:206:57Waning Gibbous13Sat
14Sun12:583.21:183.76:450.47:370.86:216:55Third Quarter14Sun
15Mon1:533.12:143.77:340.58:490.96:226:53Third Quarter15Mon
16Tue2:513.13:163.78:380.610:500.96:236:51Third Quarter16Tue
17Wed3:543.24:243.89:580.66:246:50Waning Crescent17Wed
18Thu5:023.45:354.112:080.711:20 AM0.46:256:48Waning Crescent18Thu
19Fri6:083.86:384.312:590.412:320.16:266:46Waning Crescent19Fri
20Sat7:064.27:344.61:410.11:32-0.16:276:45Waning Crescent20Sat
21Sun7:594.78:244.82:22-0.12:27-0.36:286:43New Moon21Sun
22Mon8:495.09:134.83:01-0.33:21-0.46:296:41New Moon22Mon
23Tue9:385.210:004.63:41-0.34:14-0.36:306:39New Moon23Tue
24Wed10:265.110:484.34:20-0.35:02-0.26:316:38Waxing Crescent24Wed
25Thu11:154.911:384.04:58-0.25:480.16:326:36Waxing Crescent25Thu
26Fri12:064.65:360.06:310.46:336:34Waxing Crescent26Fri
27Sat12:303.71:004.26:150.37:190.76:346:32Waxing Crescent27Sat
28Sun1:253.412:563.85:590.67:271.05:355:31First Quarter28Sun
29Mon1:213.11:543.56:520.99:341.15:365:29First Quarter29Mon
30Tue2:183.02:553.38:051.110:391.15:375:27First Quarter30Tue
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8447277)

Common Questions About Onset Beach, MA Tides

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

Slack tide in Onset Beach, MA is approximately 4:41 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 Onset Beach, MA?

Onset Beach, 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 Onset Beach, 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 Onset Beach, MA?

Tide predictions for Onset Beach, 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 Onset Beach, MA?

Tide data for Onset Beach, MA is sourced from NOAA Station #8447277. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8447277.

What is the moon phase in Onset Beach, MA tonight?

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