Tides Today & Tomorrow in Seattle, WA

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently rising in Seattle, WA.
Next low tide : 3:30 pm (5.3 ft)
Next high tide : in 5h 55m at 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 - Nov 1931

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun9:4111.16:488.91:56-0.83:238.36:524:53Third Quarter1Sun
2Mon10:4611.08:118.32:51-0.34:568.06:544:51Third Quarter2Mon
3Tue11:4611.110:027.93:520.26:157.16:554:50Third Quarter3Tue
4Wed12:3311.34:580.97:035.76:574:48Third Quarter4Wed
5Thu1:1111.66:041.57:434.06:584:47Waning Crescent5Thu
6Fri1:108.61:4311.97:062.38:212.17:004:45Waning Crescent6Fri
7Sat2:249.52:1412.28:043.38:590.37:014:44Waning Crescent7Sat
8Sun3:2910.52:4512.38:584.39:37-1.47:034:43New Moon8Sun
9Mon4:2911.33:1812.39:515.410:17-2.67:044:41New Moon9Mon
10Tue5:2612.03:5312.110:436.410:58-3.37:064:40New Moon10Tue
11Wed6:2112.44:3011.611:377.211:40-3.47:074:39Waxing Crescent11Wed
12Thu7:1612.55:1211.012:357.77:094:37Waxing Crescent12Thu
13Fri8:1112.45:5810.212:25-2.91:398.07:104:36Waxing Crescent13Fri
14Sat9:0712.16:529.31:12-2.12:567.97:124:35Waxing Crescent14Sat
15Sun10:0611.87:598.42:02-1.04:287.47:134:34First Quarter15Sun
16Mon11:0311.69:227.62:570.25:506.57:154:33First Quarter16Mon
17Tue11:5411.410:597.33:561.46:495.57:164:31First Quarter17Tue
18Wed12:3511.35:002.67:324.37:184:30First Quarter18Wed
19Thu12:357.51:0711.26:043.68:063.27:194:29Waxing Gibbous19Thu
20Fri1:558.11:3311.17:064.68:332.17:214:28Waxing Gibbous20Fri
21Sat3:008.91:5611.08:025.58:581.07:224:27Waxing Gibbous21Sat
22Sun3:529.72:1910.98:526.39:220.17:234:26Waxing Gibbous22Sun
23Mon4:3710.42:4210.89:377.09:48-0.77:254:26Full Moon23Mon
24Tue5:1611.03:0710.610:207.510:17-1.47:264:25Full Moon24Tue
25Wed5:5211.53:3310.511:018.010:49-1.87:284:24Full Moon25Wed
26Thu6:2811.84:0210.311:428.311:26-2.07:294:23Full Moon26Thu
27Fri7:0612.04:3410.112:258.47:304:23Waning Gibbous27Fri
28Sat7:4812.05:129.812:06-2.01:138.57:324:22Waning Gibbous28Sat
29Sun8:3212.05:599.412:49-1.82:088.37:334:21Waning Gibbous29Sun
30Mon9:1912.07:028.91:36-1.33:127.97:344:21Waning Gibbous30Mon
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 12:51 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 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