Tides Today & Tomorrow in South Harpswell, ME

TIDE TIMES for Saturday, July 18, 2026
The tide is currently rising in South Harpswell, ME.
Next low tide : 9:10 pm (0.2 ft)
Next high tide : in 3h 59m at 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 - Jul 2068

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun12:4110.31:209.17:05-0.47:100.75:028:25Waxing Crescent1Sun
2Mon1:2410.02:019.07:45-0.27:530.95:038:25Waxing Crescent2Mon
3Tue2:069.72:428.98:250.08:361.15:038:25Waxing Crescent3Tue
4Wed2:489.43:238.99:040.39:211.25:048:24Waxing Crescent4Wed
5Thu3:319.04:068.89:440.610:071.45:058:24First Quarter5Thu
6Fri4:178.64:508.810:260.910:561.55:058:24First Quarter6Fri
7Sat5:068.25:358.811:101.211:461.55:068:23First Quarter7Sat
8Sun5:578.06:228.811:561.45:078:23First Quarter8Sun
9Mon6:517.87:128.912:391.512:451.65:088:22Waxing Gibbous9Mon
10Tue7:487.78:049.11:361.31:381.65:088:22Waxing Gibbous10Tue
11Wed8:447.98:559.42:311.02:321.55:098:21Waxing Gibbous11Wed
12Thu9:368.19:449.83:230.63:231.25:108:21Waxing Gibbous12Thu
13Fri10:258.510:3210.34:110.24:120.85:118:20Full Moon13Fri
14Sat11:138.911:2010.74:58-0.35:010.45:128:20Full Moon14Sat
15Sun12:009.35:44-0.85:510.05:138:19Full Moon15Sun
16Mon12:0910.912:479.76:31-1.16:42-0.35:148:18Full Moon16Mon
17Tue12:5811.01:3510.17:17-1.37:33-0.55:158:17Waning Gibbous17Tue
18Wed1:4811.02:2410.38:05-1.38:26-0.65:158:17Waning Gibbous18Wed
19Thu2:4010.73:1510.48:55-1.19:22-0.55:168:16Waning Gibbous19Thu
20Fri3:3610.34:1010.49:47-0.810:21-0.35:178:15Third Quarter20Fri
21Sat4:359.85:0710.310:42-0.411:23-0.15:188:14Third Quarter21Sat
22Sun5:389.36:0610.211:400.15:198:13Third Quarter22Sun
23Mon6:438.97:0810.112:280.012:410.55:208:12Waning Crescent23Mon
24Tue7:508.78:1110.01:350.11:460.85:218:11Waning Crescent24Tue
25Wed8:548.69:1010.02:400.12:490.85:228:10Waning Crescent25Wed
26Thu9:528.710:0510.13:390.03:460.85:238:09Waning Crescent26Thu
27Fri10:448.810:5410.14:32-0.14:370.75:248:08New Moon27Fri
28Sat11:318.911:4010.05:19-0.25:240.75:268:07New Moon28Sat
29Sun12:159.06:02-0.26:080.75:278:06New Moon29Sun
30Mon12:239.912:559.06:42-0.16:490.75:288:04New Moon30Mon
31Tue1:029.81:329.17:180.07:280.75:298:03Waxing Crescent31Tue
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 6:09 pm — 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