Tides Today & Tomorrow in Union, WA

TIDE TIMES for Wednesday, August 19, 2026
The tide is currently falling in Union, WA.
Next low tide : in 3h 30m at 4:09 pm (6.9 ft)
Next high tide : 9:29 pm (10.5 ft)
Sunset today : 8:17 pm
Sunrise tomorrow : 6:14 am
Moon phase : First Quarter (47% illuminated)
Tide Station Location : Station #9445478
Common Questions About Tides

Union, WA Tides - Nov 2008

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sat8:3812.15:5110.21:03-0.72:008.17:565:54Waxing Crescent1Sat
2Sun8:2812.05:179.71:40-0.31:568.46:584:53Waxing Crescent2Sun
3Mon9:2011.85:489.21:200.23:008.46:594:51Waxing Crescent3Mon
4Tue10:1311.66:308.52:040.84:128.17:014:50First Quarter4Tue
5Wed11:0311.67:357.72:541.55:217.47:024:49First Quarter5Wed
6Thu11:4511.69:357.13:492.26:136.37:044:47First Quarter6Thu
7Fri12:2111.74:502.96:535.07:054:46First Quarter7Fri
8Sat12:147.412:5111.75:523.77:283.57:074:44Waxing Gibbous8Sat
9Sun1:328.41:1711.86:514.48:031.97:084:43Waxing Gibbous9Sun
10Mon2:349.61:4111.87:485.28:380.37:104:42Waxing Gibbous10Mon
11Tue3:2910.92:0611.98:426.09:15-1.27:114:41Full Moon11Tue
12Wed4:2112.12:3512.09:366.89:54-2.47:134:39Full Moon12Wed
13Thu5:1213.03:0612.010:287.510:36-3.37:144:38Full Moon13Thu
14Fri6:0313.53:4211.911:208.011:20-3.67:164:37Full Moon14Fri
15Sat6:5613.74:2111.612:148.47:174:36Waning Gibbous15Sat
16Sun7:5113.65:0411.012:06-3.41:148.57:194:35Waning Gibbous16Sun
17Mon8:4513.45:5410.112:56-2.72:208.37:204:34Waning Gibbous17Mon
18Tue9:3813.17:009.01:49-1.63:307.67:224:33Third Quarter18Tue
19Wed10:2912.88:517.92:45-0.14:426.47:234:32Third Quarter19Wed
20Thu11:1512.611:057.63:451.55:455.07:254:31Third Quarter20Thu
21Fri11:5712.44:483.16:383.47:264:30Waning Crescent21Fri
22Sat12:448.112:3412.25:524.57:231.97:274:29Waning Crescent22Sat
23Sun2:019.11:0812.16:545.88:030.77:294:28Waning Crescent23Sun
24Mon3:0410.21:3911.97:526.78:41-0.37:304:28Waning Crescent24Mon
25Tue3:5611.12:0711.68:477.49:18-1.07:314:27New Moon25Tue
26Wed4:4111.92:3311.49:397.99:54-1.47:334:26New Moon26Wed
27Thu5:2212.42:5811.110:288.210:29-1.57:344:25New Moon27Thu
28Fri6:0212.73:2310.811:148.411:04-1.57:354:25New Moon28Fri
29Sat6:4312.93:5010.512:018.57:374:24Waxing Crescent29Sat
30Sun7:2412.94:2010.112:518.57:384:24Waxing Crescent30Sun
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (9445478)

Common Questions About Union, WA Tides

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

Slack tide in Union, WA is approximately 6:49 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 Union, WA?

Union, WA is currently in a neap phase. Tonight's moon is 47% 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 near their weekly minimum.

What datum are Union, 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 Union, WA?

Tide predictions for Union, 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 Union, WA?

Tide data for Union, WA is sourced from NOAA Station #9445478. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=9445478.

What is the moon phase in Union, WA tonight?

Tonight the moon over Union, WA is First Quarter (47% illuminated). This places Union, WA in a neap tide cycle, so tidal ranges are near their weekly minimum 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