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 (tomorrow) : 9:39 am (-0.3 ft)
Next high tide (tomorrow) : in 5h 42m at 3:24 am (10.0 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 - May 1987

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri1:449.72:278.58:100.08:131.45:327:41Waxing Crescent1Fri
2Sat2:259.43:118.18:520.38:561.75:317:43Waxing Crescent2Sat
3Sun3:089.03:587.99:380.79:432.05:297:44Waxing Crescent3Sun
4Mon3:578.74:507.710:271.010:342.25:287:45First Quarter4Mon
5Tue4:508.45:437.611:181.311:292.35:267:46First Quarter5Tue
6Wed5:458.36:367.712:111.45:257:47First Quarter6Wed
7Thu6:428.27:288.012:272.21:031.45:247:48First Quarter7Thu
8Fri7:398.38:168.41:252.01:541.25:237:50Waxing Gibbous8Fri
9Sat8:338.49:008.92:211.52:401.05:217:51Waxing Gibbous9Sat
10Sun9:228.79:419.43:100.93:240.85:207:52Waxing Gibbous10Sun
11Mon10:098.910:2110.03:560.34:060.65:197:53Waxing Gibbous11Mon
12Tue10:549.111:0310.44:41-0.24:480.45:187:54Full Moon12Tue
13Wed11:419.311:4610.85:26-0.75:330.25:177:55Full Moon13Wed
14Thu12:299.46:12-1.06:190.25:157:56Full Moon14Thu
15Fri12:3310.91:189.37:01-1.27:080.25:147:57Waning Gibbous15Fri
16Sat1:2210.92:099.27:51-1.18:000.45:137:59Waning Gibbous16Sat
17Sun2:1510.83:059.18:45-0.98:560.65:128:00Waning Gibbous17Sun
18Mon3:1210.44:078.99:44-0.69:580.85:118:01Third Quarter18Mon
19Tue4:1610.05:118.910:45-0.311:051.05:108:02Third Quarter19Tue
20Wed5:239.76:149.011:480.05:098:03Third Quarter20Wed
21Thu6:309.47:169.212:131.012:500.25:088:04Third Quarter21Thu
22Fri7:379.28:159.51:230.81:510.35:088:05Waning Crescent22Fri
23Sat8:409.19:089.82:280.52:480.55:078:06Waning Crescent23Sat
24Sun9:389.09:5610.03:260.23:390.65:068:07Waning Crescent24Sun
25Mon10:308.910:4010.14:18-0.14:250.75:058:08Waning Crescent25Mon
26Tue11:188.911:2210.05:05-0.35:080.95:048:09New Moon26Tue
27Wed12:038.85:49-0.35:501.15:048:10New Moon27Wed
28Thu12:039.912:458.66:30-0.26:301.35:038:11New Moon28Thu
29Fri12:429.81:268.57:100.07:091.55:028:11Waxing Crescent29Fri
30Sat1:219.62:068.37:490.27:481.65:028:12Waxing Crescent30Sat
31Sun2:009.42:468.18:290.48:291.85:018:13Waxing Crescent31Sun
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 6:31 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