Tides Today & Tomorrow in Seattle, WA

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently falling in Seattle, WA.
Next low tide : in 3h 45m at 3:40 am (1.4 ft)
Next high tide : 10:13 am (8.8 ft)
Sunset today : 8:18 pm
Sunrise tomorrow : 6:08 am
Moon phase : Waxing Crescent (28% illuminated)
Tide Station Location : Station #9447130
Common Questions About Tides

Seattle, WA Tides - Apr 1932

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri2:5711.21:428.68:585.48:041.25:476:38Waning Crescent1Fri
2Sat3:2811.22:459.09:334.48:531.65:456:40Waning Crescent2Sat
3Sun3:5111.13:379.310:013.49:342.15:436:41Waning Crescent3Sun
4Mon4:0811.04:229.610:262.510:112.95:416:43New Moon4Mon
5Tue4:2310.95:059.910:491.710:463.75:396:44New Moon5Tue
6Wed4:4010.85:4510.211:140.911:204.65:376:46New Moon6Wed
7Thu5:0010.76:2610.411:410.211:555.55:356:47New Moon7Thu
8Fri5:2310.57:0710.512:11-0.35:336:48Waxing Crescent8Fri
9Sat5:4910.27:5010.612:336.312:44-0.55:316:50Waxing Crescent9Sat
10Sun6:159.88:3910.51:137.01:23-0.55:296:51Waxing Crescent10Sun
11Mon6:429.49:3710.32:007.62:06-0.35:276:53Waxing Crescent11Mon
12Tue7:129.010:4810.12:598.02:570.05:256:54First Quarter12Tue
13Wed7:588.64:248.23:560.35:236:55First Quarter13Wed
14Thu12:0310.29:31 AM8.26:147.85:010.55:216:57First Quarter14Thu
15Fri1:0110.511:11 AM8.17:147.06:060.75:196:58First Quarter15Fri
16Sat1:4010.812:368.47:515.87:070.95:187:00Waxing Gibbous16Sat
17Sun2:1111.11:499.18:254.38:021.45:167:01Waxing Gibbous17Sun
18Mon2:3911.42:539.89:002.58:532.15:147:02Waxing Gibbous18Mon
19Tue3:0611.73:5410.69:370.79:413.15:127:04Full Moon19Tue
20Wed3:3612.04:5211.210:16-1.010:304.25:107:05Full Moon20Wed
21Thu4:0712.05:5111.610:57-2.311:195.35:087:07Full Moon21Thu
22Fri4:4211.96:4911.911:40-3.05:077:08Waning Gibbous22Fri
23Sat5:2011.57:5011.812:116.412:25-3.25:057:09Waning Gibbous23Sat
24Sun6:0310.98:5311.61:097.11:14-2.85:037:11Waning Gibbous24Sun
25Mon6:5210.110:0311.32:167.62:06-1.95:017:12Third Quarter25Mon
26Tue7:519.211:1511.13:437.63:03-0.95:007:14Third Quarter26Tue
27Wed9:088.35:287.14:070.34:587:15Third Quarter27Wed
28Thu12:2111.110:43 AM7.76:496.15:161.34:567:16Third Quarter28Thu
29Fri1:1211.012:217.67:444.96:242.14:547:18Waning Crescent29Fri
30Sat1:5011.01:448.08:253.87:262.94:537:19Waning Crescent30Sat
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (9447130)

Common Questions About Seattle, WA Tides

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What time does the tide turn (slack tide) in Seattle, WA today?

Slack tide in Seattle, WA is approximately 6:56 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 Seattle, WA?

Seattle, WA is currently in a transitional phase. Tonight's moon is 28% 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 Seattle, WA 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 Seattle, WA?

Tide predictions for Seattle, WA 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 Seattle, WA?

Tide data for Seattle, WA is sourced from NOAA Station #9447130. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=9447130.

What is the moon phase in Seattle, WA tonight?

Tonight the moon over Seattle, WA is Waxing Crescent (28% illuminated). This places Seattle, WA 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