Tides Today & Tomorrow in Southwest Harbor, ME

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently falling in Southwest Harbor, ME.
Next low tide : in 2h 42m at 9:43 pm (0.8 ft)
Next high tide (tomorrow) : 4:17 am (9.5 ft)
Sunset today : 7:33 pm
Sunrise tomorrow : 5:40 am
Moon phase : First Quarter (36% illuminated)
Tide Station Location : Station #8413564
Common Questions About Tides

Southwest Harbor, ME Tides - Mar 1960

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue12:5411.21:1711.06:42-0.47:03-0.16:095:21Waxing Crescent1Tue
2Wed1:3810.92:0310.37:290.07:480.46:085:22Waxing Crescent2Wed
3Thu2:2310.42:529.78:170.58:341.06:065:24First Quarter3Thu
4Fri3:1110.03:449.29:080.99:251.56:045:25First Quarter4Fri
5Sat4:039.64:408.810:031.210:201.86:025:26First Quarter5Sat
6Sun4:599.35:398.611:011.411:181.96:015:27First Quarter6Sun
7Mon5:589.36:378.611:591.35:595:29Waxing Gibbous7Mon
8Tue6:549.47:318.912:151.812:531.15:575:30Waxing Gibbous8Tue
9Wed7:469.88:199.31:091.51:420.85:555:31Waxing Gibbous9Wed
10Thu8:3310.29:019.71:571.12:260.45:545:33Waxing Gibbous10Thu
11Fri9:1510.69:4110.22:400.73:070.05:525:34Full Moon11Fri
12Sat9:5610.910:1810.73:210.33:45-0.35:505:35Full Moon12Sat
13Sun10:3511.210:5611.14:00-0.14:23-0.55:485:36Full Moon13Sun
14Mon11:1511.411:3511.44:40-0.55:01-0.65:465:38Full Moon14Mon
15Tue11:5711.45:21-0.75:41-0.65:455:39Waning Gibbous15Tue
16Wed12:1611.612:4111.36:05-0.86:24-0.55:435:40Waning Gibbous16Wed
17Thu1:0011.71:2911.06:52-0.87:11-0.25:415:41Waning Gibbous17Thu
18Fri1:4911.52:2210.67:44-0.68:040.15:395:43Third Quarter18Fri
19Sat2:4311.33:2110.28:42-0.49:030.45:375:44Third Quarter19Sat
20Sun3:4311.04:269.99:46-0.110:090.75:355:45Third Quarter20Sun
21Mon4:5010.75:369.810:540.011:190.75:345:46Third Quarter21Mon
22Tue6:0010.76:4410.012:02-0.15:325:48Waning Crescent22Tue
23Wed7:0810.97:4710.412:280.51:06-0.35:305:49Waning Crescent23Wed
24Thu8:0911.28:4310.81:310.12:04-0.65:285:50Waning Crescent24Thu
25Fri9:0511.49:3311.22:28-0.42:56-0.85:265:51New Moon25Fri
26Sat9:5511.610:1911.53:19-0.73:44-0.85:245:53New Moon26Sat
27Sun10:4211.611:0211.54:06-0.94:28-0.75:225:54New Moon27Sun
28Mon11:2611.411:4311.44:51-0.85:10-0.55:215:55New Moon28Mon
29Tue12:0811.05:34-0.75:51-0.15:195:56Waxing Crescent29Tue
30Wed12:2311.212:5010.66:16-0.46:310.45:175:57Waxing Crescent30Wed
31Thu1:0410.81:3310.16:580.07:120.85:155:59Waxing Crescent31Thu
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 1:00 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 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 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 (36% 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