Tides Today & Tomorrow in Merrimacport, MA

TIDE TIMES for Wednesday, August 19, 2026
The tide is currently falling in Merrimacport, MA.
Next low tide : in 4h 50m at 12:31 pm (0.8 ft)
Next high tide : 6:16 pm (7.1 ft)
Sunset today : 7:40 pm
Sunrise tomorrow : 5:54 am
Moon phase : First Quarter (46% illuminated)
Tide Station Location : Station #8440369
Common Questions About Tides

Merrimacport, MA Tides - Aug 1937

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun8:066.78:358.02:310.22:460.45:348:05Waning Crescent1Sun
2Mon9:076.69:358.13:310.13:450.45:358:04Waning Crescent2Mon
3Tue10:086.610:348.24:30-0.14:420.35:368:03Waning Crescent3Tue
4Wed11:066.611:308.25:25-0.35:370.15:388:01Waning Crescent4Wed
5Thu12:016.86:18-0.46:310.05:398:00New Moon5Thu
6Fri12:238.212:536.97:10-0.47:23-0.15:407:59New Moon6Fri
7Sat1:148.21:427.17:58-0.48:13-0.15:417:58New Moon7Sat
8Sun2:028.02:287.28:45-0.49:020.05:427:56Waxing Crescent8Sun
9Mon2:487.83:137.39:30-0.29:500.15:437:55Waxing Crescent9Mon
10Tue3:327.53:577.310:150.010:380.25:447:54Waxing Crescent10Tue
11Wed4:187.24:437.311:010.211:280.45:457:52Waxing Crescent11Wed
12Thu5:056.95:317.211:480.55:467:51First Quarter12Thu
13Fri5:546.66:207.112:190.612:370.85:477:49First Quarter13Fri
14Sat6:446.37:107.01:110.81:281.05:487:48First Quarter14Sat
15Sun7:366.18:027.02:050.92:201.15:497:46First Quarter15Sun
16Mon8:305.98:576.93:000.93:141.25:507:45Waxing Gibbous16Mon
17Tue9:255.99:507.03:540.94:071.15:517:43Waxing Gibbous17Tue
18Wed10:185.910:417.14:460.84:571.05:537:42Waxing Gibbous18Wed
19Thu11:086.111:297.35:340.65:450.95:547:40Waxing Gibbous19Thu
20Fri11:556.46:210.56:320.75:557:39Full Moon20Fri
21Sat12:157.512:406.77:060.37:180.55:567:37Full Moon21Sat
22Sun1:007.61:257.07:490.28:030.35:577:36Full Moon22Sun
23Mon1:457.82:107.48:310.08:480.15:587:34Full Moon23Mon
24Tue2:307.82:547.79:130.09:340.05:597:32Waning Gibbous24Tue
25Wed3:167.83:417.99:560.010:23-0.16:007:31Waning Gibbous25Wed
26Thu4:057.64:308.010:430.111:16-0.16:017:29Waning Gibbous26Thu
27Fri4:577.45:238.111:340.26:027:28Third Quarter27Fri
28Sat5:527.16:188.112:130.012:290.36:037:26Third Quarter28Sat
29Sun6:496.87:158.01:110.01:260.56:057:24Third Quarter29Sun
30Mon7:486.68:157.92:110.12:260.56:067:23Third Quarter30Mon
31Tue8:496.59:177.83:110.13:270.56:077:21Waning Crescent31Tue
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8440369)

Common Questions About Merrimacport, MA Tides

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

Slack tide in Merrimacport, MA is approximately 3:23 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 Merrimacport, MA?

Merrimacport, MA is currently in a neap phase. Tonight's moon is 46% 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 near their weekly minimum.

What datum are Merrimacport, 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 Merrimacport, MA?

Tide predictions for Merrimacport, 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 Merrimacport, MA?

Tide data for Merrimacport, MA is sourced from NOAA Station #8440369. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8440369.

What is the moon phase in Merrimacport, MA tonight?

Tonight the moon over Merrimacport, MA is First Quarter (46% illuminated). This places Merrimacport, MA in a neap tide cycle, so tidal ranges are near their weekly minimum 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