Tides Today & Tomorrow in Southwest Harbor, ME

TIDE TIMES for Tuesday, July 21, 2026
The tide is currently falling in Southwest Harbor, ME.
Next low tide : in 3h 31m at 11:17 pm (1.0 ft)
Next high tide (tomorrow) : 5:52 am (9.3 ft)
Sunset today : 8:10 pm
Sunrise tomorrow : 5:09 am
Moon phase : First Quarter (52% illuminated)
Tide Station Location : Station #8413564
Common Questions About Tides

Southwest Harbor, ME Tides - Jan 1976

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu10:0612.010:4210.73:30-0.14:06-1.17:084:04New Moon1Thu
2Fri10:5411.911:2810.74:180.04:52-1.07:094:05New Moon2Fri
3Sat11:3911.65:050.15:36-0.77:094:06Waxing Crescent3Sat
4Sun12:1210.612:2311.35:500.36:19-0.47:084:07Waxing Crescent4Sun
5Mon12:5510.41:0710.86:350.67:020.07:084:08Waxing Crescent5Mon
6Tue1:3810.11:5110.37:200.97:440.47:084:09Waxing Crescent6Tue
7Wed2:229.92:379.88:061.28:280.87:084:10First Quarter7Wed
8Thu3:079.73:269.38:551.49:131.27:084:11First Quarter8Thu
9Fri3:559.54:198.99:471.510:031.57:084:12First Quarter9Fri
10Sat4:469.45:158.710:421.610:551.77:074:13First Quarter10Sat
11Sun5:399.56:128.611:381.411:491.77:074:14Waxing Gibbous11Sun
12Mon6:329.77:078.712:331.27:074:15Waxing Gibbous12Mon
13Tue7:2310.07:599.012:411.61:240.87:064:16Waxing Gibbous13Tue
14Wed8:1110.48:469.41:311.32:110.37:064:17Waxing Gibbous14Wed
15Thu8:5610.99:309.92:180.92:56-0.27:054:19Full Moon15Thu
16Fri9:4011.410:1310.43:030.53:39-0.67:054:20Full Moon16Fri
17Sat10:2411.810:5610.83:470.14:21-1.07:044:21Full Moon17Sat
18Sun11:0912.111:4011.24:32-0.25:05-1.37:044:22Full Moon18Sun
19Mon11:5512.15:19-0.55:49-1.37:034:24Waning Gibbous19Mon
20Tue12:2611.412:4312.06:07-0.66:36-1.27:024:25Waning Gibbous20Tue
21Wed1:1411.51:3411.76:59-0.67:26-1.07:024:26Waning Gibbous21Wed
22Thu2:0511.52:2911.17:54-0.58:19-0.67:014:28Third Quarter22Thu
23Fri3:0011.33:2910.68:53-0.39:16-0.17:004:29Third Quarter23Fri
24Sat3:5911.14:3410.19:57-0.110:190.36:594:30Third Quarter24Sat
25Sun5:0311.05:439.811:050.011:240.56:584:32Third Quarter25Sun
26Mon6:0910.96:509.712:120.06:584:33Waning Crescent26Mon
27Tue7:1311.07:549.812:300.61:15-0.26:574:34Waning Crescent27Tue
28Wed8:1211.28:5010.11:320.52:13-0.56:564:36Waning Crescent28Wed
29Thu9:0611.39:4110.32:280.33:04-0.66:554:37New Moon29Thu
30Fri9:5411.410:2610.53:180.13:51-0.76:544:38New Moon30Fri
31Sat10:3911.411:0810.54:040.04:34-0.76:534:40New Moon31Sat
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 2:34 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 neap phase. Tonight's moon is 52% 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 minimum.

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 (52% illuminated). This places Southwest Harbor, ME in a neap tide cycle, so tidal ranges are near their weekly minimum 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