Tides Today & Tomorrow in Harwich Port, MA

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently rising in Harwich Port, MA.
Next low tide : 10:59 pm (0.3 ft)
Next high tide : in 4h 20m at 5:07 pm (3.9 ft)
Sunset today : 7:36 pm
Sunrise tomorrow : 5:52 am
Moon phase : First Quarter (36% illuminated)
Tide Station Location : Station #8447506
Common Questions About Tides

Harwich Port, MA Tides - Dec 2011

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu4:273.64:413.79:590.410:330.26:474:11First Quarter1Thu
2Fri5:233.65:393.510:590.511:270.46:484:10First Quarter2Fri
3Sat6:183.56:383.411:580.66:494:10First Quarter3Sat
4Sun7:103.57:353.312:200.512:550.66:504:10Waxing Gibbous4Sun
5Mon8:013.68:313.31:110.61:510.56:514:10Waxing Gibbous5Mon
6Tue8:503.79:233.32:010.62:440.46:524:10Waxing Gibbous6Tue
7Wed9:353.710:093.32:490.63:300.36:534:09Waxing Gibbous7Wed
8Thu10:173.810:513.43:330.64:130.26:544:09Full Moon8Thu
9Fri10:563.911:323.44:150.54:530.16:554:09Full Moon9Fri
10Sat11:353.94:550.55:320.16:564:09Full Moon10Sat
11Sun12:123.412:144.05:360.46:120.06:564:10Full Moon11Sun
12Mon12:523.512:544.06:170.46:520.06:574:10Waning Gibbous12Mon
13Tue1:323.51:354.06:590.47:33-0.16:584:10Waning Gibbous13Tue
14Wed2:133.52:184.07:430.38:16-0.16:594:10Waning Gibbous14Wed
15Thu2:563.63:043.98:290.39:010.07:004:10Waning Gibbous15Thu
16Fri3:423.73:543.99:200.39:500.07:004:11Third Quarter16Fri
17Sat4:313.74:483.810:150.310:420.07:014:11Third Quarter17Sat
18Sun5:243.85:473.711:140.211:370.17:024:11Third Quarter18Sun
19Mon6:194.06:483.612:140.17:024:12Third Quarter19Mon
20Tue7:174.17:523.612:330.11:150.07:034:12Waning Crescent20Tue
21Wed8:154.28:553.71:320.12:17-0.27:034:12Waning Crescent21Wed
22Thu9:144.39:553.72:300.03:16-0.37:044:13Waning Crescent22Thu
23Fri10:104.510:513.83:280.04:12-0.57:044:13New Moon23Fri
24Sat11:034.511:453.94:22-0.15:05-0.57:054:14New Moon24Sat
25Sun11:564.55:14-0.15:55-0.57:054:15New Moon25Sun
26Mon12:373.912:474.46:06-0.16:45-0.57:054:15Waxing Crescent26Mon
27Tue1:283.91:374.36:560.07:32-0.47:064:16Waxing Crescent27Tue
28Wed2:163.82:264.17:460.18:19-0.27:064:17Waxing Crescent28Wed
29Thu3:033.73:153.98:360.29:050.07:064:17Waxing Crescent29Thu
30Fri3:513.64:053.79:270.39:530.27:064:18First Quarter30Fri
31Sat4:393.64:583.410:200.510:440.47:074:19First Quarter31Sat
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8447506)

Common Questions About Harwich Port, MA Tides

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

Slack tide in Harwich Port, MA is approximately 8:03 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 Harwich Port, MA?

Harwich Port, 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 Harwich Port, 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 Harwich Port, MA?

Tide predictions for Harwich Port, 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 Harwich Port, MA?

Tide data for Harwich Port, MA is sourced from NOAA Station #8447506. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8447506.

What is the moon phase in Harwich Port, MA tonight?

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