Tides Today & Tomorrow in Fort Sumter, SC

TIDE TIMES for Monday, August 17, 2026
The tide is currently rising in Fort Sumter, SC.
Next low tide : 6:31 pm (0.7 ft)
Next high tide : in 2h 02m at 12:30 pm (5.5 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 - Mar 2001

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu11:364.35:440.35:560.06:466:16First Quarter1Thu
2Fri12:015.012:324.26:450.56:540.06:456:17First Quarter2Fri
3Sat1:045.01:394.27:520.57:590.06:446:18First Quarter3Sat
4Sun2:155.12:534.29:010.49:08-0.16:436:19First Quarter4Sun
5Mon3:315.24:094.410:080.210:15-0.46:416:19Waxing Gibbous5Mon
6Tue4:445.55:164.811:10-0.211:19-0.76:406:20Waxing Gibbous6Tue
7Wed5:465.86:155.212:06-0.56:396:21Waxing Gibbous7Wed
8Thu6:426.07:105.512:18-1.012:59-0.86:386:22Full Moon8Thu
9Fri7:346.18:025.81:14-1.21:48-1.06:366:23Full Moon9Fri
10Sat8:246.08:535.92:07-1.32:35-1.06:356:23Full Moon10Sat
11Sun9:125.89:435.82:59-1.23:20-0.96:346:24Waning Gibbous11Sun
12Mon9:595.510:315.73:49-0.94:05-0.76:336:25Waning Gibbous12Mon
13Tue10:455.111:215.54:39-0.54:49-0.36:316:26Waning Gibbous13Tue
14Wed11:334.75:31-0.15:360.06:306:26Waning Gibbous14Wed
15Thu12:125.212:244.46:260.26:270.46:296:27Third Quarter15Thu
16Fri1:055.01:174.27:240.57:220.66:276:28Third Quarter16Fri
17Sat2:004.82:134.18:210.78:200.86:266:28Third Quarter17Sat
18Sun2:574.73:104.19:180.79:190.86:256:29Third Quarter18Sun
19Mon3:554.74:084.210:110.710:150.76:236:30Waning Crescent19Mon
20Tue4:494.85:014.411:000.611:060.56:226:31Waning Crescent20Tue
21Wed5:374.95:484.611:440.411:530.36:216:31Waning Crescent21Wed
22Thu6:195.16:304.912:240.36:206:32Waning Crescent22Thu
23Fri6:595.27:095.012:360.21:010.16:186:33New Moon23Fri
24Sat7:365.27:455.21:160.01:360.06:176:33New Moon24Sat
25Sun8:115.18:195.31:560.02:11-0.16:166:34New Moon25Sun
26Mon8:445.08:515.42:35-0.12:45-0.16:146:35New Moon26Mon
27Tue9:164.99:245.43:140.03:21-0.16:136:36Waxing Crescent27Tue
28Wed9:514.710:035.53:550.14:00-0.16:126:36Waxing Crescent28Wed
29Thu10:324.610:495.54:400.24:440.06:106:37Waxing Crescent29Thu
30Fri11:224.511:445.45:310.45:360.16:096:38First Quarter30Fri
31Sat12:234.46:310.56:360.26:086:38First Quarter31Sat
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8665728)

Common Questions About Fort Sumter, SC Tides

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

Slack tide in Fort Sumter, SC is approximately 3:30 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