Tides Today & Tomorrow in Southwest Harbor, ME

TIDE TIMES for Sunday, August 16, 2026
The tide is currently falling in Southwest Harbor, ME.
Next low tide : in 4h 33m at 7:35 am (-0.3 ft)
Next high tide : 2:12 pm (11.2 ft)
Sunset today : 7:37 pm
Sunrise tomorrow : 5:38 am
Moon phase : Waxing Crescent (18% illuminated)
Tide Station Location : Station #8413564
Common Questions About Tides

Southwest Harbor, ME Tides - Feb 1965

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Mon10:3510.711:059.64:011.04:320.06:514:42New Moon1Mon
2Tue11:1010.811:399.84:370.95:060.06:504:44New Moon2Tue
3Wed11:4510.85:120.85:400.06:484:45Waxing Crescent3Wed
4Thu12:139.912:2110.75:480.86:130.06:474:46Waxing Crescent4Thu
5Fri12:4710.012:5810.66:250.76:480.16:464:48Waxing Crescent5Fri
6Sat1:2410.11:3810.37:050.77:260.26:454:49Waxing Crescent6Sat
7Sun2:0410.22:2310.17:490.68:090.46:434:51First Quarter7Sun
8Mon2:4910.33:149.78:390.68:570.76:424:52First Quarter8Mon
9Tue3:4010.34:129.49:360.69:530.96:414:53First Quarter9Tue
10Wed4:3710.45:179.210:390.510:551.06:394:55First Quarter10Wed
11Thu5:4110.66:269.311:470.26:384:56Waxing Gibbous11Thu
12Fri6:4710.97:339.612:020.912:54-0.26:374:58Waxing Gibbous12Fri
13Sat7:5211.48:3510.11:090.61:57-0.76:354:59Waxing Gibbous13Sat
14Sun8:5211.99:3210.72:110.12:55-1.26:345:00Full Moon14Sun
15Mon9:4812.310:2511.13:09-0.43:48-1.56:325:02Full Moon15Mon
16Tue10:4212.511:1511.44:04-0.74:39-1.76:315:03Full Moon16Tue
17Wed11:3312.44:56-0.95:28-1.66:295:04Waning Gibbous17Wed
18Thu12:0411.512:2312.15:47-0.96:16-1.26:285:06Waning Gibbous18Thu
19Fri12:5211.41:1311.56:38-0.77:04-0.76:265:07Waning Gibbous19Fri
20Sat1:4011.22:0410.87:29-0.37:52-0.16:255:09Waning Gibbous20Sat
21Sun2:2910.82:5710.18:220.18:420.66:235:10Third Quarter21Sun
22Mon3:2010.33:539.49:170.69:351.26:215:11Third Quarter22Mon
23Tue4:149.94:538.810:150.910:321.76:205:13Third Quarter23Tue
24Wed5:129.55:558.511:151.211:311.96:185:14Third Quarter24Wed
25Thu6:129.46:558.512:161.26:175:15Waning Crescent25Thu
26Fri7:099.57:508.612:301.91:121.16:155:17Waning Crescent26Fri
27Sat8:029.78:398.91:241.72:020.86:135:18Waning Crescent27Sat
28Sun8:4810.09:219.32:121.52:460.56:115:19Waning Crescent28Sun
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 10:53 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 Southwest Harbor, ME?

Southwest Harbor, ME is currently in a spring phase. Tonight's moon is 18% 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 maximum.

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 Waxing Crescent (18% illuminated). This places Southwest Harbor, ME in a spring tide cycle, so tidal ranges are near their weekly maximum 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