Tides Today & Tomorrow in Southwest Harbor, ME

TIDE TIMES for Friday, August 21, 2026
The tide is currently falling in Southwest Harbor, ME.
Next low tide : in 2m at 11:46 am (2.2 ft)
Next high tide : 6:27 pm (9.6 ft)
Sunset today : 7:28 pm
Sunrise tomorrow : 5:43 am
Moon phase : First Quarter (65% illuminated)
Tide Station Location : Station #8413564
Common Questions About Tides

Southwest Harbor, ME Tides - Feb 1956

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed1:5311.42:1810.97:43-0.48:06-0.26:524:41Waning Gibbous1Wed
2Thu2:4510.93:1310.18:380.18:580.56:514:42Third Quarter2Thu
3Fri3:3810.54:129.49:360.59:541.16:494:44Third Quarter3Fri
4Sat4:3510.15:138.910:360.910:521.56:484:45Third Quarter4Sat
5Sun5:349.86:158.711:371.011:521.76:474:47Third Quarter5Sun
6Mon6:339.77:148.712:361.06:464:48Waning Crescent6Mon
7Tue7:299.88:068.912:491.61:300.86:454:49Waning Crescent7Tue
8Wed8:1910.08:539.11:411.42:170.66:434:51Waning Crescent8Wed
9Thu9:0310.39:349.52:271.23:000.46:424:52Waning Crescent9Thu
10Fri9:4410.510:119.83:090.93:380.16:414:54New Moon10Fri
11Sat10:2110.710:4610.03:470.74:130.06:394:55New Moon11Sat
12Sun10:5610.811:1910.34:230.54:47-0.16:384:56New Moon12Sun
13Mon11:3110.811:5310.54:590.35:20-0.16:364:58New Moon13Mon
14Tue12:0710.85:340.25:53-0.16:354:59Waxing Crescent14Tue
15Wed12:2810.612:4510.66:120.16:290.06:335:01Waxing Crescent15Wed
16Thu1:0510.81:2610.46:520.17:090.26:325:02Waxing Crescent16Thu
17Fri1:4710.82:1210.17:380.17:540.46:315:03First Quarter17Fri
18Sat2:3410.73:059.78:290.28:450.76:295:05First Quarter18Sat
19Sun3:2810.64:059.49:280.39:450.96:275:06First Quarter19Sun
20Mon4:3010.65:139.310:340.310:520.96:265:07First Quarter20Mon
21Tue5:3710.76:239.511:430.16:245:09Waxing Gibbous21Tue
22Wed6:4610.97:299.912:020.712:51-0.36:235:10Waxing Gibbous22Wed
23Thu7:5111.48:3010.51:090.31:52-0.86:215:12Waxing Gibbous23Thu
24Fri8:5011.99:2511.12:10-0.32:48-1.26:205:13Full Moon24Fri
25Sat9:4512.210:1511.63:07-0.83:39-1.56:185:14Full Moon25Sat
26Sun10:3612.311:0311.93:59-1.24:28-1.66:165:16Full Moon26Sun
27Mon11:2612.211:5011.94:49-1.35:15-1.46:155:17Full Moon27Mon
28Tue12:1411.85:38-1.26:00-1.06:135:18Waning Gibbous28Tue
29Wed12:3611.81:0111.26:26-0.96:46-0.46:115:20Waning Gibbous29Wed
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8413564)

Common Questions About Southwest Harbor, ME Tides

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What time does the tide turn (slack tide) in Southwest Harbor, ME today?

Slack tide in Southwest Harbor, ME is approximately 3:06 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 Southwest Harbor, ME?

Southwest Harbor, ME is currently in a transitional phase. Tonight's moon is 65% 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 Southwest Harbor, ME 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 Southwest Harbor, ME?

Tide predictions for Southwest Harbor, ME 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 Southwest Harbor, ME?

Tide data for Southwest Harbor, ME is sourced from NOAA Station #8413564. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8413564.

What is the moon phase in Southwest Harbor, ME tonight?

Tonight the moon over Southwest Harbor, ME is First Quarter (65% illuminated). This places Southwest Harbor, ME 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