Tides Today & Tomorrow in Fort Sumter, SC

TIDE TIMES for Monday, August 17, 2026
The tide is currently falling in Fort Sumter, SC.
Next low tide : in 32m at 6:31 pm (0.7 ft)
Next high tide (tomorrow) : 12:30 am (5.0 ft)
Sunset today : 8:02 pm
Sunrise tomorrow : 6:44 am
Moon phase : Waxing Crescent (27% illuminated)
Tide Station Location : Station #8665728
Common Questions About Tides

Fort Sumter, SC Tides - Aug 2000

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue9:495.510:126.43:39-0.63:47-0.86:338:17New Moon1Tue
2Wed10:465.511:046.24:29-0.64:41-0.66:348:16Waxing Crescent2Wed
3Thu11:425.511:545.95:18-0.45:35-0.36:358:16Waxing Crescent3Thu
4Fri12:365.56:07-0.26:300.16:358:15Waxing Crescent4Fri
5Sat12:455.51:315.46:570.07:280.46:368:14First Quarter5Sat
6Sun1:355.22:245.47:480.28:270.76:378:13First Quarter6Sun
7Mon2:244.93:155.48:380.49:240.86:378:12First Quarter7Mon
8Tue3:144.74:075.49:280.510:190.96:388:11First Quarter8Tue
9Wed4:054.64:585.410:180.611:120.96:398:10Waxing Gibbous9Wed
10Thu4:584.55:475.511:070.66:398:09Waxing Gibbous10Thu
11Fri5:494.66:335.612:010.811:54 AM0.66:408:08Waxing Gibbous11Fri
12Sat6:384.77:175.712:480.712:400.56:418:07Waxing Gibbous12Sat
13Sun7:234.87:585.71:310.61:230.46:418:06Full Moon13Sun
14Mon8:054.98:375.72:110.52:050.46:428:05Full Moon14Mon
15Tue8:464.99:145.72:490.52:450.46:438:04Full Moon15Tue
16Wed9:245.09:495.63:260.43:250.46:438:03Full Moon16Wed
17Thu10:005.010:225.54:010.44:050.56:448:02Waning Gibbous17Thu
18Fri10:365.110:555.44:360.34:460.56:458:01Waning Gibbous18Fri
19Sat11:145.211:335.35:140.35:310.76:457:59Waning Gibbous19Sat
20Sun11:585.35:550.36:210.86:467:58Waning Gibbous20Sun
21Mon12:175.212:505.56:410.37:190.96:477:57Third Quarter21Mon
22Tue1:105.01:485.67:340.38:230.96:477:56Third Quarter22Tue
23Wed2:114.92:525.88:330.29:300.96:487:55Third Quarter23Wed
24Thu3:164.93:595.99:360.110:360.76:497:54Waning Crescent24Thu
25Fri4:275.05:086.210:400.011:390.56:497:52Waning Crescent25Fri
26Sat5:365.26:136.411:43-0.26:507:51Waning Crescent26Sat
27Sun6:405.47:126.612:380.212:44-0.46:517:50Waning Crescent27Sun
28Mon7:395.78:066.61:330.01:42-0.56:517:49New Moon28Mon
29Tue8:355.98:586.62:26-0.22:37-0.56:527:47New Moon29Tue
30Wed9:296.09:486.43:15-0.33:30-0.46:537:46New Moon30Wed
31Thu10:226.010:366.24:02-0.34:22-0.26:537:45Waxing Crescent31Thu
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8665728)

Common Questions About Fort Sumter, SC Tides

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What time does the tide turn (slack tide) in Fort Sumter, SC today?

Slack tide in Fort Sumter, SC is approximately 9:30 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 Fort Sumter, SC?

Fort Sumter, SC is currently in a transitional phase. Tonight's moon is 27% 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 Fort Sumter, SC 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 Fort Sumter, SC?

Tide predictions for Fort Sumter, SC 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 Fort Sumter, SC?

Tide data for Fort Sumter, SC is sourced from NOAA Station #8665728. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8665728.

What is the moon phase in Fort Sumter, SC tonight?

Tonight the moon over Fort Sumter, SC is Waxing Crescent (27% illuminated). This places Fort Sumter, SC 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