Tides Today & Tomorrow in Merrimacport, MA

TIDE TIMES for Tuesday, July 21, 2026
The tide is currently falling in Merrimacport, MA.
Next low tide : in 2h 47m at 1:07 pm (0.5 ft)
Next high tide : 6:55 pm (7.1 ft)
Sunset today : 8:16 pm
Sunrise tomorrow : 5:24 am
Moon phase : First Quarter (52% illuminated)
Tide Station Location : Station #8440369
Common Questions About Tides

Merrimacport, MA Tides - Jun 2078

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed5:057.75:426.512:030.45:078:16Third Quarter1Wed
2Thu5:587.66:366.612:121.312:550.35:078:16Third Quarter2Thu
3Fri6:537.67:306.91:091.11:470.35:078:17Third Quarter3Fri
4Sat7:507.48:267.22:090.92:410.25:068:18Third Quarter4Sat
5Sun8:497.39:237.63:090.63:350.25:068:19Waning Crescent5Sun
6Mon9:487.210:178.04:070.34:270.15:068:19Waning Crescent6Mon
7Tue10:457.111:108.35:03-0.15:180.15:058:20Waning Crescent7Tue
8Wed11:407.05:58-0.46:090.15:058:21New Moon8Wed
9Thu12:028.612:347.06:52-0.67:010.25:058:21New Moon9Thu
10Fri12:538.71:276.97:45-0.77:520.25:058:22New Moon10Fri
11Sat1:448.72:186.88:36-0.68:420.35:058:22New Moon11Sat
12Sun2:348.63:076.79:26-0.59:330.55:048:23Waxing Crescent12Sun
13Mon3:238.33:576.610:16-0.310:250.75:048:23Waxing Crescent13Mon
14Tue4:138.04:486.511:06-0.111:180.85:048:24Waxing Crescent14Tue
15Wed5:047.65:406.411:570.25:048:24First Quarter15Wed
16Thu5:567.36:316.412:121.012:480.45:048:24First Quarter16Thu
17Fri6:486.97:226.51:071.11:380.65:058:25First Quarter17Fri
18Sat7:406.68:146.62:021.12:280.75:058:25First Quarter18Sat
19Sun8:336.49:056.72:571.13:190.95:058:25Waxing Gibbous19Sun
20Mon9:276.29:546.93:511.04:081.05:058:26Waxing Gibbous20Mon
21Tue10:196.110:417.14:420.94:551.05:058:26Waxing Gibbous21Tue
22Wed11:076.011:267.25:310.75:401.15:068:26Waxing Gibbous22Wed
23Thu11:536.06:180.66:251.25:068:26Full Moon23Thu
24Fri12:107.412:386.17:050.57:101.25:068:26Full Moon24Fri
25Sat12:537.51:236.17:500.47:531.25:078:26Full Moon25Sat
26Sun1:377.72:086.28:340.38:361.15:078:26Full Moon26Sun
27Mon2:217.82:526.49:180.29:191.15:078:26Waning Gibbous27Mon
28Tue3:067.93:396.510:020.210:051.05:088:26Waning Gibbous28Tue
29Wed3:537.94:276.710:480.110:550.95:088:26Waning Gibbous29Wed
30Thu4:437.95:196.911:370.111:500.95:098:26Waning Gibbous30Thu
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 4:01 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 neap phase. Tonight's moon is 52% 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 (52% 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