Tides Today & Tomorrow in Onset Beach, MA

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently falling in Onset Beach, MA.
Next low tide : in 4h 46m at 6:50 am (0.4 ft)
Next high tide : 1:34 pm (3.9 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 - Dec 1932

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu10:474.411:153.84:21-0.25:330.16:504:13Waxing Crescent1Thu
2Fri11:444.15:140.16:280.36:514:12Waxing Crescent2Fri
3Sat12:133.612:423.86:120.47:390.46:524:12First Quarter3Sat
4Sun1:123.51:373.57:350.78:500.56:534:12First Quarter4Sun
5Mon2:093.52:313.29:350.79:400.66:544:12First Quarter5Mon
6Tue3:053.43:263.010:400.710:140.56:554:12First Quarter6Tue
7Wed4:033.44:232.911:260.610:450.56:564:12Waxing Gibbous7Wed
8Thu4:583.55:172.912:030.56:574:12Waxing Gibbous8Thu
9Fri5:473.56:042.912:360.46:584:12Waxing Gibbous9Fri
10Sat6:293.66:463.01:100.36:594:12Waxing Gibbous10Sat
11Sun7:073.77:253.112:350.21:470.26:594:12Full Moon11Sun
12Mon7:423.78:033.11:150.12:280.17:004:12Full Moon12Mon
13Tue8:173.78:403.11:570.03:080.17:014:12Full Moon13Tue
14Wed8:523.69:193.12:390.03:470.17:024:12Full Moon14Wed
15Thu9:293.69:593.03:200.04:220.17:024:12Waning Gibbous15Thu
16Fri10:093.510:433.04:000.14:540.27:034:13Waning Gibbous16Fri
17Sat10:523.411:303.04:400.15:260.27:044:13Waning Gibbous17Sat
18Sun11:403.35:230.26:030.27:044:13Waning Gibbous18Sun
19Mon12:193.112:313.36:120.36:470.27:054:14Third Quarter19Mon
20Tue1:113.31:243.27:140.47:410.27:064:14Third Quarter20Tue
21Wed2:043.52:203.18:310.48:420.17:064:15Third Quarter21Wed
22Thu3:003.73:213.19:550.39:440.07:074:15Waning Crescent22Thu
23Fri4:024.04:283.111:080.110:44-0.27:074:16Waning Crescent23Fri
24Sat5:054.25:323.312:09-0.17:074:16Waning Crescent24Sat
25Sun6:054.56:313.51:04-0.37:084:17Waning Crescent25Sun
26Mon7:014.77:253.812:35-0.51:58-0.37:084:18New Moon26Mon
27Tue7:554.88:183.91:29-0.62:53-0.47:094:18New Moon27Tue
28Wed8:464.79:093.92:25-0.63:44-0.47:094:19New Moon28Wed
29Thu9:374.510:013.93:20-0.54:29-0.37:094:20Waxing Crescent29Thu
30Fri10:284.310:533.84:12-0.35:08-0.27:094:21Waxing Crescent30Fri
31Sat11:193.95:01-0.15:440.07:094:21Waxing Crescent31Sat
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8447277)

Common Questions About Onset Beach, MA Tides

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

Slack tide in Onset Beach, MA is approximately 10:12 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