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 2h 11m 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 - Apr 2068

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun10:4710.711:1111.04:31-1.24:55-1.26:197:07New Moon1Sun
2Mon11:4110.85:24-1.75:45-1.36:177:08New Moon2Mon
3Tue12:0111.312:3310.76:16-1.96:34-1.26:157:10New Moon3Tue
4Wed12:5011.41:2410.57:07-1.97:23-0.96:147:11Waxing Crescent4Wed
5Thu1:3811.22:1610.07:58-1.68:13-0.46:127:12Waxing Crescent5Thu
6Fri2:2810.73:099.58:51-1.19:040.26:107:13Waxing Crescent6Fri
7Sat3:2110.24:068.99:46-0.510:000.76:087:14First Quarter7Sat
8Sun4:189.65:058.510:440.111:001.26:077:16First Quarter8Sun
9Mon5:199.06:068.211:450.66:057:17First Quarter9Mon
10Tue6:218.77:078.112:031.512:470.96:037:18First Quarter10Tue
11Wed7:248.58:058.21:091.61:481.06:017:19Waxing Gibbous11Wed
12Thu8:238.58:578.52:111.52:421.06:007:20Waxing Gibbous12Thu
13Fri9:168.69:428.83:061.23:290.95:587:22Waxing Gibbous13Fri
14Sat10:028.710:229.13:530.94:090.85:567:23Waxing Gibbous14Sat
15Sun10:458.810:599.34:340.64:460.75:557:24Full Moon15Sun
16Mon11:248.911:349.55:120.35:200.75:537:25Full Moon16Mon
17Tue12:028.95:480.15:540.75:517:26Full Moon17Tue
18Wed12:089.612:388.96:22-0.16:280.75:507:28Full Moon18Wed
19Thu12:419.71:148.96:58-0.17:040.75:487:29Waning Gibbous19Thu
20Fri1:169.81:518.87:35-0.27:420.85:477:30Waning Gibbous20Fri
21Sat1:539.82:318.78:15-0.28:240.95:457:31Waning Gibbous21Sat
22Sun2:359.83:168.69:00-0.19:110.95:437:32Waning Gibbous22Sun
23Mon3:229.74:078.69:490.010:041.05:427:34Third Quarter23Mon
24Tue4:179.65:048.610:440.111:021.05:407:35Third Quarter24Tue
25Wed5:179.56:048.811:410.15:397:36Third Quarter25Wed
26Thu6:219.47:069.212:050.812:420.15:377:37Third Quarter26Thu
27Fri7:289.58:079.71:120.51:44-0.15:367:38Waning Crescent27Fri
28Sat8:349.79:0510.22:180.02:44-0.35:347:40Waning Crescent28Sat
29Sun9:359.99:5810.83:19-0.63:39-0.55:337:41Waning Crescent29Sun
30Mon10:3110.110:4911.14:16-1.14:32-0.65:317:42New Moon30Mon
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