Tides Today & Tomorrow in Merrimacport, MA

TIDE TIMES for Monday, August 17, 2026
The tide is currently rising in Merrimacport, MA.
Next low tide : 11:23 pm (0.3 ft)
Next high tide : in 13m at 4:40 pm (7.4 ft)
Sunset today : 7:43 pm
Sunrise tomorrow : 5:52 am
Moon phase : Waxing Crescent (27% illuminated)
Tide Station Location : Station #8440369
Common Questions About Tides

Merrimacport, MA Tides - Mar 1941

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sat2:117.02:317.18:540.29:160.26:195:32Waxing Crescent1Sat
2Sun2:537.03:156.99:390.310:000.46:185:34Waxing Crescent2Sun
3Mon3:387.04:016.710:260.410:460.66:165:35Waxing Crescent3Mon
4Tue4:247.04:496.511:160.611:340.86:145:36First Quarter4Tue
5Wed5:137.05:396.312:070.76:135:37First Quarter5Wed
6Thu6:036.96:316.212:240.91:010.76:115:39First Quarter6Thu
7Fri6:566.97:266.11:181.01:560.76:095:40First Quarter7Fri
8Sat7:517.08:226.22:121.02:510.66:085:41Waxing Gibbous8Sat
9Sun8:477.29:176.43:060.83:430.36:065:42Waxing Gibbous9Sun
10Mon9:407.410:096.73:580.64:330.16:045:43Waxing Gibbous10Mon
11Tue10:327.710:597.04:480.35:21-0.26:035:45Waxing Gibbous11Tue
12Wed11:227.911:497.55:38-0.16:09-0.56:015:46Full Moon12Wed
13Thu12:138.16:28-0.46:57-0.75:595:47Full Moon13Thu
14Fri12:387.81:028.27:18-0.77:43-0.85:575:48Full Moon14Fri
15Sat1:278.21:528.28:08-0.98:31-0.85:565:49Waning Gibbous15Sat
16Sun2:168.42:438.08:59-0.99:20-0.65:545:51Waning Gibbous16Sun
17Mon3:078.43:357.79:52-0.810:13-0.45:525:52Waning Gibbous17Mon
18Tue4:008.34:297.310:48-0.711:07-0.25:505:53Third Quarter18Tue
19Wed4:558.15:267.011:45-0.45:495:54Third Quarter19Wed
20Thu5:517.86:236.612:040.112:43-0.25:475:55Third Quarter20Thu
21Fri6:497.57:236.41:020.31:410.05:455:56Third Quarter21Fri
22Sat7:497.38:236.32:010.42:390.15:435:58Waning Crescent22Sat
23Sun8:497.19:216.42:580.43:330.15:425:59Waning Crescent23Sun
24Mon9:447.110:126.53:520.44:240.15:406:00Waning Crescent24Mon
25Tue10:337.010:586.64:430.35:120.25:386:01Waning Crescent25Tue
26Wed11:187.011:416.85:320.35:580.25:366:02New Moon26Wed
27Thu12:017.06:180.26:410.25:346:03New Moon27Thu
28Fri12:216.912:427.07:030.27:230.35:336:04New Moon28Fri
29Sat1:017.11:237.07:450.28:040.45:316:06New Moon29Sat
30Sun1:417.22:046.98:280.28:450.55:296:07Waxing Crescent30Sun
31Mon2:227.32:466.89:110.39:270.75:276:08Waxing Crescent31Mon
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 8:01 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 transitional phase. Tonight's moon is 27% 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 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 Waxing Crescent (27% illuminated). This places Merrimacport, 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