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 49m at 3:40 am (1.4 ft)
Next high tide : 10:13 am (8.8 ft)
Sunset today : 8:16 pm
Sunrise tomorrow : 6:09 am
Moon phase : First Quarter (37% illuminated)
Tide Station Location : Station #9447130
Common Questions About Tides

Seattle, WA Tides - Jan 1932

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri10:2512.611:508.13:403.65:292.07:574:27Third Quarter1Fri
2Sat11:0412.44:415.66:240.57:574:28Waning Crescent2Sat
3Sun1:469.011:47 AM12.15:587.37:16-0.87:574:29Waning Crescent3Sun
4Mon3:1410.312:3411.87:278.38:06-1.87:574:30Waning Crescent4Mon
5Tue4:1611.41:2411.68:508.78:53-2.57:574:31Waning Crescent5Tue
6Wed5:0412.22:1511.39:578.79:39-2.77:574:32New Moon6Wed
7Thu5:4512.63:0611.010:528.410:23-2.77:574:34New Moon7Thu
8Fri6:2212.73:5710.711:407.911:05-2.37:564:35New Moon8Fri
9Sat6:5512.74:4810.312:257.57:564:36Waxing Crescent9Sat
10Sun7:2612.55:399.81:096.97:564:37Waxing Crescent10Sun
11Mon7:5412.46:329.212:27-0.91:536.27:554:38Waxing Crescent11Mon
12Tue8:2212.27:298.61:060.22:385.57:554:40Waxing Crescent12Tue
13Wed8:4912.08:328.01:441.63:254.77:544:41First Quarter13Wed
14Thu9:1811.89:497.62:223.14:123.87:544:42First Quarter14Thu
15Fri9:4811.411:297.73:024.85:002.97:534:43First Quarter15Fri
16Sat10:2211.03:496.45:482.07:524:45First Quarter16Sat
17Sun1:418.410:59 AM10.64:597.86:361.27:524:46First Quarter17Sun
18Mon3:139.511:42 AM10.36:478.87:210.47:514:48Waxing Gibbous18Mon
19Tue4:0210.412:2910.28:329.08:05-0.47:504:49Waxing Gibbous19Tue
20Wed4:3711.11:1910.29:329.08:48-1.17:494:50Waxing Gibbous20Wed
21Thu5:0611.62:0710.310:098.89:30-1.87:484:52Full Moon21Thu
22Fri5:3312.02:5510.610:408.510:12-2.27:484:53Full Moon22Fri
23Sat5:5812.23:4310.711:118.010:53-2.57:474:55Full Moon23Sat
24Sun6:2412.44:3310.811:487.211:34-2.37:464:56Full Moon24Sun
25Mon6:5112.65:2610.612:286.37:454:58Waning Gibbous25Mon
26Tue7:1912.86:2410.212:15-1.61:135.27:444:59Waning Gibbous26Tue
27Wed7:4912.97:289.612:56-0.32:013.97:425:01Waning Gibbous27Wed
28Thu8:2112.98:409.01:381.42:532.77:415:02Third Quarter28Thu
29Fri8:5412.710:078.62:233.43:481.57:405:04Third Quarter29Fri
30Sat9:3212.33:145.44:460.57:395:05Third Quarter30Sat
31Sun12:048.810:15 AM11.84:207.35:47-0.27:385:07Third Quarter31Sun
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 37% 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 First Quarter (37% 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