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 59m 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 - Sep 1932

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu9:224.59:404.53:35-0.23:47-0.26:087:16New Moon1Thu
2Fri10:084.710:274.44:12-0.34:36-0.26:097:15Waxing Crescent2Fri
3Sat10:554.811:154.24:49-0.35:23-0.26:107:13Waxing Crescent3Sat
4Sun11:464.75:28-0.36:110.06:117:11Waxing Crescent4Sun
5Mon12:084.012:404.66:09-0.17:030.36:127:10Waxing Crescent5Mon
6Tue1:043.71:384.46:540.18:110.66:137:08First Quarter6Tue
7Wed2:043.52:384.27:490.410:220.86:147:06First Quarter7Wed
8Thu3:053.43:434.09:010.711:460.86:157:04First Quarter8Thu
9Fri4:113.34:524.010:480.86:167:03Waxing Gibbous9Fri
10Sat5:203.46:004.012:450.712:200.76:177:01Waxing Gibbous10Sat
11Sun6:243.66:584.11:320.61:150.56:186:59Waxing Gibbous11Sun
12Mon7:183.97:464.22:090.51:580.46:196:58Waxing Gibbous12Mon
13Tue8:064.18:294.22:380.42:350.36:206:56Full Moon13Tue
14Wed8:484.29:094.23:000.33:120.36:216:54Full Moon14Wed
15Thu9:294.39:474.03:250.23:500.26:226:52Full Moon15Thu
16Fri10:074.210:243.83:530.24:270.26:236:51Full Moon16Fri
17Sat10:434.111:013.64:250.25:050.36:246:49Waning Gibbous17Sat
18Sun11:183.911:393.34:590.25:410.46:256:47Waning Gibbous18Sun
19Mon11:543.75:330.36:180.66:266:45Waning Gibbous19Mon
20Tue12:193.112:333.46:090.56:580.96:276:44Waning Gibbous20Tue
21Wed1:042.91:163.26:480.77:461.16:286:42Third Quarter21Wed
22Thu1:512.72:053.17:350.99:031.26:296:40Third Quarter22Thu
23Fri2:422.72:593.18:361.010:561.26:316:38Third Quarter23Fri
24Sat3:372.83:583.29:531.011:551.06:326:37Third Quarter24Sat
25Sun3:382.94:033.310:100.811:350.75:335:35Waning Crescent25Sun
26Mon4:403.25:033.611:120.55:345:33Waning Crescent26Mon
27Tue5:353.75:563.912:090.412:040.25:355:31Waning Crescent27Tue
28Wed6:244.16:434.212:430.112:53-0.15:365:30New Moon28Wed
29Thu7:104.67:304.41:18-0.21:41-0.35:375:28New Moon29Thu
30Fri7:564.98:174.41:55-0.42:30-0.45:385:26New Moon30Fri
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