Tides Today & Tomorrow in Union, WA
Printing our tide charts?
Help us keep our doors open and lights on by registering as a member of US Harbors.
It's simple and free!
Union, WA Tides - May 2015
| Date | High Tide | Low Tide | Sun | Moon | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AM | ft | PM | ft | AM | ft | PM | ft | Rise | Set | |||
| 1 | Fri | 3:42 | 11.3 | 4:47 | 10.3 | 10:11 | 1.6 | 10:15 | 4.7 | 5:55 | 8:23 |  |
| 2 | Sat | 4:11 | 11.2 | 5:30 | 11.0 | 10:46 | 0.8 | 11:00 | 5.0 | 5:53 | 8:24 | |
| 3 | Sun | 4:37 | 11.1 | 6:12 | 11.5 | 11:21 | 0.1 | 11:43 | 5.4 | 5:52 | 8:26 | |
| 4 | Mon | 5:01 | 10.9 | 6:54 | 11.8 | 11:55 | -0.4 | 5:50 | 8:27 |  | ||
| 5 | Tue | 5:23 | 10.6 | 7:37 | 12.0 | 12:27 | 5.9 | 12:29 | -0.7 | 5:49 | 8:28 | |
| 6 | Wed | 5:48 | 10.4 | 8:22 | 12.1 | 1:11 | 6.3 | 1:05 | -0.8 | 5:47 | 8:30 | |
| 7 | Thu | 6:17 | 10.0 | 9:09 | 12.1 | 1:59 | 6.7 | 1:42 | -0.7 | 5:46 | 8:31 | |
| 8 | Fri | 6:53 | 9.6 | 9:58 | 12.0 | 2:52 | 6.9 | 2:24 | -0.4 | 5:44 | 8:32 |  |
| 9 | Sat | 7:37 | 9.1 | 10:50 | 12.0 | 3:51 | 6.9 | 3:11 | 0.1 | 5:43 | 8:34 | |
| 10 | Sun | 8:36 | 8.4 | 11:41 | 11.9 | 4:54 | 6.5 | 4:05 | 0.8 | 5:42 | 8:35 | |
| 11 | Mon | 10:01 | 7.8 | 5:58 | 5.8 | 5:08 | 1.6 | 5:40 | 8:36 |  | ||
| 12 | Tue | 12:31 | 11.9 | 12:10 | 7.7 | 6:57 | 4.6 | 6:16 | 2.4 | 5:39 | 8:38 | |
| 13 | Wed | 1:17 | 12.0 | 1:49 | 8.4 | 7:50 | 3.1 | 7:24 | 3.2 | 5:38 | 8:39 | |
| 14 | Thu | 2:00 | 12.0 | 3:03 | 9.4 | 8:38 | 1.6 | 8:27 | 4.0 | 5:36 | 8:40 | |
| 15 | Fri | 2:41 | 12.1 | 4:06 | 10.5 | 9:24 | 0.1 | 9:28 | 4.6 | 5:35 | 8:41 |  |
| 16 | Sat | 3:20 | 12.1 | 5:02 | 11.6 | 10:09 | -1.2 | 10:25 | 5.2 | 5:34 | 8:43 | |
| 17 | Sun | 3:59 | 12.0 | 5:55 | 12.3 | 10:53 | -2.1 | 11:19 | 5.7 | 5:33 | 8:44 | |
| 18 | Mon | 4:38 | 11.7 | 6:45 | 12.8 | 11:36 | -2.5 | 5:31 | 8:45 |  | ||
| 19 | Tue | 5:15 | 11.4 | 7:34 | 13.0 | 12:11 | 6.1 | 12:19 | -2.5 | 5:30 | 8:46 | |
| 20 | Wed | 5:53 | 10.8 | 8:22 | 12.9 | 1:03 | 6.4 | 1:02 | -2.1 | 5:29 | 8:48 | |
| 21 | Thu | 6:30 | 10.1 | 9:10 | 12.7 | 1:56 | 6.6 | 1:44 | -1.4 | 5:28 | 8:49 |  |
| 22 | Fri | 7:09 | 9.3 | 9:58 | 12.4 | 2:52 | 6.7 | 2:28 | -0.5 | 5:27 | 8:50 | |
| 23 | Sat | 7:54 | 8.5 | 10:45 | 12.1 | 3:51 | 6.5 | 3:14 | 0.6 | 5:26 | 8:51 | |
| 24 | Sun | 8:58 | 7.7 | 11:32 | 11.8 | 4:52 | 6.1 | 4:02 | 1.7 | 5:25 | 8:52 | |
| 25 | Mon | 10:41 | 7.1 | 5:53 | 5.5 | 4:54 | 2.8 | 5:24 | 8:53 |  | ||
| 26 | Tue | 12:16 | 11.6 | 12:25 | 7.1 | 6:49 | 4.6 | 5:52 | 3.8 | 5:23 | 8:54 | |
| 27 | Wed | 12:57 | 11.4 | 1:46 | 7.6 | 7:37 | 3.6 | 6:52 | 4.6 | 5:23 | 8:55 | |
| 28 | Thu | 1:35 | 11.3 | 2:52 | 8.4 | 8:20 | 2.6 | 7:51 | 5.3 | 5:22 | 8:57 | |
| 29 | Fri | 2:09 | 11.2 | 3:47 | 9.3 | 8:59 | 1.5 | 8:47 | 5.8 | 5:21 | 8:58 | |
| 30 | Sat | 2:41 | 11.1 | 4:36 | 10.2 | 9:37 | 0.5 | 9:41 | 6.1 | 5:20 | 8:59 | |
| 31 | Sun | 3:10 | 11.0 | 5:20 | 11.0 | 10:14 | -0.4 | 10:32 | 6.4 | 5:20 | 8:59 | |
| Date | High Tide | Low Tide | Sun | Moon | ||||||||
| AM | ft | PM | ft | AM | ft | PM | ft | Rise | Set | |||
www.USHarbors.com
© 2026 US Harbors LLC All rights reserved
The US Harbors tide chart design is protected by copyright. It may be printed for personal use only.
Any commercial use, modification, redistribution, or repackaging without written permission is strictly prohibited.
Common Questions About Union, WA Tides
Show AllWhat time does the tide turn (slack tide) in Union, WA today?
Slack tide in Union, WA is approximately 10:28 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 Union, WA?
Union, WA is currently in a transitional phase. Tonight's moon is 69% 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 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 (69% illuminated). This places Union, 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.
FEATURED CONTENT
In The Zone: The Sabre 51 Salon Express
By US Harbors When Sabre Yachts completed construction of hull number 200 of its 48 Salon Express model, more than half the crew who built it had also worked on hull number one. The average tenure on that line was 12 years, and they produced a yacht that proved to… Learn More
Coastal News Updates See All
A Tale of Two Gulf of Alaska Crossings: Yacht and Tugboat
By Norris Comer, best4boats. The Gulf of Alaska is one of those bodies of water… More
7 Ways El Niño and Large Marine Heatwave Could Affect West Coast Marine Species
By fisheries.noaa.gov, fisheries.noaa.gov. A large marine heatwave has bathed parts of the West Coast in very warm… More
Meet The Great Marsh Shellfish Company, Oyster Growers in Massachusetts
By fisheries.noaa.gov, fisheries.noaa.gov. When you farm shellfish on Massachusetts’ beautiful coastal marshes, the world is… More
Celebrate National Fishing and Boating Week!
By fisheries.noaa.gov, fisheries.noaa.gov. Marine recreational fishing is a cherished American pastime and draws millions of… More
NOAA Fisheries Announces $2.3 Million to Study Atlantic Mackerel with the Northeast Fishing Industry
By fisheries.noaa.gov, fisheries.noaa.gov. NOAA Fisheries is beginning a cooperative research initiative, partnering with the Northeast… More
Reconnecting Rivers Boosts Oregon Coast Coho Recovery
By fisheries.noaa.gov, fisheries.noaa.gov. NOAA Fisheries supports one of the most ambitious salmon restoration projects on… More
WHOI Develops Tool to Predict Coral Bleaching Months Before It Strikes
By whoi.edu, whoi.edu. A new forecasting tool from Woods Hole Oceanographic Institution could give reef… More
Remarkably Bright Creatures: A Story of Octopus Intelligence Set in the Pacific Northwest
By Janet Green Hammerman, best4boats.com. The Netflix adaptation of Shelby Van Pelt's bestselling novel Remarkably… More
A Year in the Life of Larry the Whale Shark
By fisheries.noaa.gov, fisheries.noaa.gov. One year ago today, researchers deployed a satellite tag on a whale… More
