Tides Today & Tomorrow in South Harpswell, ME

TIDE TIMES for Saturday, July 18, 2026
The tide is currently falling in South Harpswell, ME.
Next low tide : in 3h 25m at 8:49 am (-0.8 ft)
Next high tide : 3:08 pm (9.8 ft)
Sunset today : 8:17 pm
Sunrise tomorrow : 5:15 am
Moon phase : Waxing Crescent (23% illuminated)
Tide Station Location : Station #8417647
Common Questions About Tides

South Harpswell, ME Tides - Mar 2068

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu8:1410.18:529.31:540.22:36-0.76:145:29Waning Crescent1Thu
2Fri9:1110.69:4510.02:52-0.43:29-1.26:125:30New Moon2Fri
3Sat10:0511.010:3510.63:47-1.14:19-1.66:115:32New Moon3Sat
4Sun10:5811.211:2411.14:41-1.65:08-1.86:095:33New Moon4Sun
5Mon11:5011.15:33-1.95:57-1.76:075:34Waxing Crescent5Mon
6Tue12:1311.212:4110.86:25-1.96:46-1.46:065:35Waxing Crescent6Tue
7Wed1:0211.11:3310.37:17-1.77:36-0.96:045:37Waxing Crescent7Wed
8Thu1:5310.82:299.78:11-1.28:29-0.36:025:38Waxing Crescent8Thu
9Fri2:4810.23:289.09:10-0.69:260.46:005:39First Quarter9Fri
10Sat3:479.74:318.510:120.010:280.95:595:40First Quarter10Sat
11Sun5:509.26:368.112:170.46:576:42First Quarter11Sun
12Mon6:558.97:428.012:341.31:250.76:556:43First Quarter12Mon
13Tue8:018.78:438.11:421.42:290.76:536:44Waxing Gibbous13Tue
14Wed9:008.89:358.32:451.33:230.66:516:45Waxing Gibbous14Wed
15Thu9:508.910:208.63:381.04:090.56:506:47Waxing Gibbous15Thu
16Fri10:359.111:008.94:230.74:490.46:486:48Waxing Gibbous16Fri
17Sat11:169.211:369.15:040.55:250.36:466:49Full Moon17Sat
18Sun11:539.25:410.35:570.36:446:50Full Moon18Sun
19Mon12:109.312:299.26:150.16:280.36:426:52Full Moon19Mon
20Tue12:429.41:039.16:490.17:000.46:416:53Full Moon20Tue
21Wed1:129.41:378.97:220.07:320.56:396:54Waning Gibbous21Wed
22Thu1:449.42:128.77:580.18:070.76:376:55Waning Gibbous22Thu
23Fri2:189.42:508.58:360.18:460.86:356:56Waning Gibbous23Fri
24Sat2:579.33:338.39:190.39:311.06:336:58Waning Gibbous24Sat
25Sun3:439.24:248.110:090.410:221.16:326:59Third Quarter25Sun
26Mon4:369.25:218.111:040.511:191.16:307:00Third Quarter26Mon
27Tue5:369.26:238.212:030.46:287:01Third Quarter27Tue
28Wed6:419.37:288.612:221.01:070.36:267:02Waning Crescent28Wed
29Thu7:489.58:319.11:290.72:11-0.16:247:04Waning Crescent29Thu
30Fri8:539.99:289.82:350.13:10-0.56:237:05Waning Crescent30Fri
31Sat9:5210.310:2110.53:35-0.64:04-1.06:217:06Waning Crescent31Sat
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8417647)

Common Questions About South Harpswell, ME Tides

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What time does the tide turn (slack tide) in South Harpswell, ME today?

Slack tide in South Harpswell, ME is approximately 11:58 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 South Harpswell, ME?

South Harpswell, ME is currently in a transitional phase. Tonight's moon is 23% 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 South Harpswell, 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 South Harpswell, ME?

Tide predictions for South Harpswell, 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 South Harpswell, ME?

Tide data for South Harpswell, ME is sourced from NOAA Station #8417647. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8417647.

What is the moon phase in South Harpswell, ME tonight?

Tonight the moon over South Harpswell, ME is Waxing Crescent (23% illuminated). This places South Harpswell, 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