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 : 7:43 pm (0.8 ft)
Next high tide : in 3h 52m at 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 - Apr 1932

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri5:133.35:343.412:280.45:256:07Waning Crescent1Fri
2Sat6:043.46:233.612:360.312:530.35:236:08Waning Crescent2Sat
3Sun6:473.57:053.81:070.21:120.25:216:09Waning Crescent3Sun
4Mon7:263.57:423.91:370.11:350.15:206:11New Moon4Mon
5Tue8:013.58:173.92:110.02:030.05:186:12New Moon5Tue
6Wed8:363.48:493.92:46-0.12:35-0.15:166:13New Moon6Wed
7Thu9:103.39:213.83:23-0.13:10-0.15:156:14New Moon7Thu
8Fri9:443.29:523.63:580.03:440.05:136:15Waxing Crescent8Fri
9Sat10:213.010:263.44:320.14:180.15:116:16Waxing Crescent9Sat
10Sun11:012.811:053.25:050.34:540.25:106:17Waxing Crescent10Sun
11Mon11:462.711:523.15:400.45:320.45:086:18Waxing Crescent11Mon
12Tue12:362.66:210.66:180.55:076:19First Quarter12Tue
13Wed12:463.01:292.77:190.87:180.65:056:20First Quarter13Wed
14Thu1:443.02:262.88:500.88:370.65:036:21First Quarter14Thu
15Fri2:453.13:273.110:120.610:000.45:026:23First Quarter15Fri
16Sat3:513.34:303.411:020.311:100.15:006:24Waxing Gibbous16Sat
17Sun4:563.55:293.911:440.04:596:25Waxing Gibbous17Sun
18Mon5:543.86:224.412:08-0.212:25-0.34:576:26Waxing Gibbous18Mon
19Tue6:464.07:124.81:01-0.41:06-0.54:566:27Full Moon19Tue
20Wed7:374.28:015.11:53-0.61:49-0.64:546:28Full Moon20Wed
21Thu8:274.28:515.12:46-0.72:35-0.74:536:29Full Moon21Thu
22Fri9:174.19:425.03:39-0.63:22-0.64:516:30Waning Gibbous22Fri
23Sat10:103.910:364.74:29-0.44:10-0.34:506:31Waning Gibbous23Sat
24Sun12:053.76:18-0.15:58-0.15:487:32Waning Gibbous24Sun
25Mon12:334.31:033.57:120.26:500.35:477:33Waning Gibbous25Mon
26Tue1:333.92:033.48:390.57:530.65:457:35Third Quarter26Tue
27Wed2:343.63:033.310:180.610:110.85:447:36Third Quarter27Wed
28Thu3:353.44:043.311:210.711:400.85:427:37Third Quarter28Thu
29Fri4:363.25:063.412:050.65:417:38Waning Crescent29Fri
30Sat5:363.26:043.512:310.712:350.65:407:39Waning Crescent30Sat
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 4:38 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 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