Tides Today & Tomorrow in Merrimacport, MA

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently rising in Merrimacport, MA.
Next low tide : 11:42 am (0.5 ft)
Next high tide : in 3h 16m at 5:03 am (6.8 ft)
Sunset today : 7:41 pm
Sunrise tomorrow : 5:53 am
Moon phase : First Quarter (36% illuminated)
Tide Station Location : Station #8440369
Common Questions About Tides

Merrimacport, MA Tides - Jun 1940

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sat9:406.410:077.04:060.94:250.85:078:15Waning Crescent1Sat
2Sun10:306.410:547.24:560.75:120.85:078:16Waning Crescent2Sun
3Mon11:186.411:397.45:440.65:570.85:068:17Waning Crescent3Mon
4Tue12:056.56:310.46:430.85:068:17New Moon4Tue
5Wed12:247.712:516.67:180.37:270.85:068:18New Moon5Wed
6Thu1:087.91:366.78:030.18:110.75:058:19New Moon6Thu
7Fri1:538.12:226.98:470.08:550.75:058:19New Moon7Fri
8Sat2:388.23:097.09:32-0.19:410.65:058:20Waxing Crescent8Sat
9Sun3:258.33:587.110:19-0.210:300.65:058:21Waxing Crescent9Sun
10Mon4:158.34:497.211:09-0.211:240.55:048:21Waxing Crescent10Mon
11Tue5:088.15:437.412:01-0.25:048:22First Quarter11Tue
12Wed6:038.06:387.512:210.512:54-0.25:048:22First Quarter12Wed
13Thu6:597.77:347.71:190.41:48-0.25:048:23First Quarter13Thu
14Fri7:577.58:317.82:190.32:44-0.15:048:23First Quarter14Fri
15Sat8:567.29:288.03:180.13:39-0.15:048:24Waxing Gibbous15Sat
16Sun9:567.110:248.14:16-0.14:330.05:048:24Waxing Gibbous16Sun
17Mon10:527.011:178.35:11-0.35:260.05:048:24Waxing Gibbous17Mon
18Tue11:466.96:05-0.46:170.15:048:25Full Moon18Tue
19Wed12:088.312:386.86:56-0.47:080.15:048:25Full Moon19Wed
20Thu12:578.31:276.87:46-0.47:570.25:058:25Full Moon20Thu
21Fri1:448.22:146.88:34-0.38:450.45:058:25Full Moon21Fri
22Sat2:308.12:596.79:20-0.29:320.55:058:26Waning Gibbous22Sat
23Sun3:157.93:446.710:06-0.110:190.75:058:26Waning Gibbous23Sun
24Mon4:007.74:306.710:530.111:090.85:068:26Waning Gibbous24Mon
25Tue4:477.45:186.711:400.311:590.95:068:26Waning Gibbous25Tue
26Wed5:367.26:076.812:280.45:068:26Third Quarter26Wed
27Thu6:256.96:566.812:511.01:170.65:078:26Third Quarter27Thu
28Fri7:166.77:476.91:441.02:070.75:078:26Third Quarter28Fri
29Sat8:086.58:387.02:381.02:580.85:088:26Third Quarter29Sat
30Sun9:016.39:307.13:320.93:480.95:088:26Waning Crescent30Sun
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 8:22 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 Merrimacport, MA?

Merrimacport, 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 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 (36% 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