Tides Today & Tomorrow in Fort Sumter, SC

TIDE TIMES for Friday, August 21, 2026
The tide is currently rising in Fort Sumter, SC.
Next low tide : 10:10 pm (1.4 ft)
Next high tide : in 4h 55m at 3:50 pm (5.2 ft)
Sunset today : 7:58 pm
Sunrise tomorrow : 6:47 am
Moon phase : First Quarter (65% illuminated)
Tide Station Location : Station #8665728
Common Questions About Tides

Fort Sumter, SC Tides - Oct 1994

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sat5:025.35:235.911:080.711:430.87:137:04Waning Crescent1Sat
2Sun5:585.76:166.112:050.57:147:03Waning Crescent2Sun
3Mon6:496.07:056.212:330.41:000.27:147:02New Moon3Mon
4Tue7:386.47:536.31:210.11:530.07:157:00New Moon4Tue
5Wed8:286.78:436.32:10-0.12:46-0.17:166:59New Moon5Wed
6Thu9:206.89:346.22:58-0.33:39-0.27:176:58New Moon6Thu
7Fri10:146.810:296.03:48-0.34:32-0.17:176:56Waxing Crescent7Fri
8Sat11:116.711:255.84:38-0.25:260.27:186:55Waxing Crescent8Sat
9Sun12:116.65:310.06:240.47:196:54Waxing Crescent9Sun
10Mon12:265.61:146.46:290.37:250.67:196:53First Quarter10Mon
11Tue1:305.42:176.27:320.58:270.77:206:51First Quarter11Tue
12Wed2:345.43:186.08:380.79:280.87:216:50First Quarter12Wed
13Thu3:365.44:175.99:420.810:240.77:226:49Waxing Gibbous13Thu
14Fri4:365.55:125.910:430.811:170.77:226:48Waxing Gibbous14Fri
15Sat5:325.76:025.811:400.77:236:47Waxing Gibbous15Sat
16Sun6:225.86:465.812:050.612:310.77:246:45Waxing Gibbous16Sun
17Mon7:066.07:275.812:500.51:190.67:256:44Full Moon17Mon
18Tue7:476.18:065.71:310.42:030.67:256:43Full Moon18Tue
19Wed8:256.18:455.62:090.52:440.77:266:42Full Moon19Wed
20Thu9:026.19:235.42:460.53:230.87:276:41Full Moon20Thu
21Fri9:386.010:015.33:220.64:010.97:286:40Waning Gibbous21Fri
22Sat10:145.910:385.13:570.74:371.07:286:39Waning Gibbous22Sat
23Sun10:495.711:154.94:320.85:131.27:296:37Waning Gibbous23Sun
24Mon11:255.611:544.85:090.95:521.37:306:36Waning Gibbous24Mon
25Tue12:065.55:501.06:351.47:316:35Waning Gibbous25Tue
26Wed12:384.712:545.56:381.17:251.47:326:34Third Quarter26Wed
27Thu1:304.81:475.47:341.18:191.37:336:33Third Quarter27Thu
28Fri2:274.92:445.58:351.19:151.17:336:32Third Quarter28Fri
29Sat3:265.13:435.69:380.910:100.87:346:31Waning Crescent29Sat
30Sun3:275.43:435.79:400.710:060.56:355:30Waning Crescent30Sun
31Mon4:275.84:415.810:410.410:590.16:365:29Waning Crescent31Mon
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 7:00 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 65% 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 First Quarter (65% 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