Nearby Harbors
44.2759’ N, 68.3187’ W

Southwest Harbor, ME

58°
H 65°
L 58°
ENE
1mph
Low tide
9:16 am
Photo Credits

Tides Today & Tomorrow in Southwest Harbor, ME

TIDE TIMES for Thursday, September 17, 2026
The tide is currently falling in Southwest Harbor, ME.
Next low tide : in 1h 43m at 9:16 am (1.8 ft)
Next high tide : 3:53 pm (9.9 ft)
Sunset today : 6:40 pm
Sunrise tomorrow : 6:14 am
Moon phase : First Quarter (39% illuminated)
Tide Station Location : Station #8413564
Common Questions About Tides

Featured Local Businesses

A red hull lobster yacht cruising in calm water

John Williams Boat Company
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Hamilton Marine - Southwest Harbor
Charles M Young Painting of Maine Coast

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Southwest Harbor, ME Tides - Sep 2026

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue1:5010.82:0911.37:320.28:020.05:567:09Waning Gibbous1Tue
2Wed2:3610.42:5511.28:160.58:520.15:577:08Third Quarter2Wed
3Thu3:2710.03:4711.19:050.89:490.35:587:06Third Quarter3Thu
4Fri4:259.64:4610.910:021.110:530.45:597:04Third Quarter4Fri
5Sat5:319.35:5210.811:071.36:017:02Third Quarter5Sat
6Sun6:419.37:0310.812:020.512:171.36:027:00Waning Crescent6Sun
7Mon7:519.58:1111.01:110.31:271.16:036:59Waning Crescent7Mon
8Tue8:549.99:1311.42:150.02:320.66:046:57Waning Crescent8Tue
9Wed9:5110.510:0911.73:13-0.43:300.26:056:55New Moon9Wed
10Thu10:4111.011:0111.84:05-0.64:24-0.26:066:53New Moon10Thu
11Fri11:2811.311:4911.74:53-0.75:13-0.56:076:51New Moon11Fri
12Sat12:1311.55:38-0.66:00-0.56:096:49New Moon12Sat
13Sun12:3511.412:5511.46:21-0.36:46-0.36:106:47Waxing Crescent13Sun
14Mon1:2010.91:3711.27:030.27:310.06:116:46Waxing Crescent14Mon
15Tue2:0510.42:2010.87:450.88:160.46:126:44Waxing Crescent15Tue
16Wed2:529.83:0410.48:291.39:040.86:136:42Waxing Crescent16Wed
17Thu3:409.23:539.99:161.89:551.36:146:40First Quarter17Thu
18Fri4:338.84:469.610:082.210:511.66:166:38First Quarter18Fri
19Sat5:308.45:449.311:042.411:501.76:176:36First Quarter19Sat
20Sun6:308.36:449.312:042.46:186:34First Quarter20Sun
21Mon7:288.57:419.512:481.61:022.36:196:33Waxing Gibbous21Mon
22Tue8:208.88:329.81:411.41:551.96:206:31Waxing Gibbous22Tue
23Wed9:069.39:1810.22:291.02:421.56:216:29Waxing Gibbous23Wed
24Thu9:479.810:0010.63:110.73:261.06:236:27Waxing Gibbous24Thu
25Fri10:2510.310:4110.93:500.34:060.56:246:25Full Moon25Fri
26Sat11:0110.911:2111.04:270.14:460.06:256:23Full Moon26Sat
27Sun11:3811.35:04-0.15:26-0.36:266:21Full Moon27Sun
28Mon12:0111.112:1711.65:42-0.16:08-0.66:276:19Waning Gibbous28Mon
29Tue12:4411.012:5811.86:220.06:53-0.66:286:18Waning Gibbous29Tue
30Wed1:2910.81:4311.77:060.37:42-0.56:306:16Waning Gibbous30Wed
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8413564)

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Common Questions About Southwest Harbor, ME Tides

Collapse All
When is the lowest tide this week in Southwest Harbor, ME?

The lowest tide this week in Southwest Harbor, ME is 0.7 ft on Thursday, Sep 24 at 3:11 am.

When is the highest tide this week in Southwest Harbor, ME?

The highest tide this week in Southwest Harbor, ME is 10.2 ft on Wednesday, Sep 23 at 9:18 pm — worth noting for launching your boat and being alert for possible high tide flooding.

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 39% 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 time is high tide in Southwest Harbor, ME today?

High tides in Southwest Harbor, ME today: 3:40 am (9.2 ft), 3:53 pm (9.9 ft). The 3:53 pm high of 9.9 ft is notably higher than the other — known as diurnal inequality, common on coasts influenced by lunar declination.

What time is low tide in Southwest Harbor, ME today?

Low tides in Southwest Harbor, ME today: 9:16 am (1.8 ft), 9:55 pm (1.3 ft).

What is the tidal range in Southwest Harbor, ME today?

Today's tidal range in Southwest Harbor, ME is 8.7 ft — the difference between the day's highest and lowest water level. This month's average daily range is about 10.5 ft, so today's swing is below-average.

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

Tonight the moon over Southwest Harbor, ME is First Quarter (39% illuminated). This places Southwest Harbor, ME in a transitional tide cycle, so tidal ranges are shifting between spring and neap this week.

What type of tides does Southwest Harbor, ME have — semi-diurnal, diurnal, or mixed?

Southwest Harbor, ME has semi-diurnal tides — two high tides and two low tides roughly every 24 hours and 50 minutes, with similar heights.

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

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