Union (WA) water temp

This data the coastal Union ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current ocean temperature in Union

Water temperature in Union today is 49.1°F. Based on our historical data over a period of ten years, the warmest water in this day in Union was recorded in 2022 and was 56.1°F, and the coldest was recorded in 2012 at 51.6°F. Sea water temperature in Union is expected to rise to 51.6°F in the next 10 days. October average water temperature in Union is 53.2°F, the minimum temperature is 48.7°F, and the maximum is 59.2°F.

Throughout the year, the water temperature in Union does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Union in winter reaches 46.8°F, in spring 49.5°F, in summer the average temperature rises to 57.4°F, and in autumn it is 53.4°F.

Union water temperature now

The ocean salinity in Union is 27.42‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Union for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Union. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Union. Data in table shown for October 18, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Union

Union weather forecast

Current temperature and weather

Data in a table show Union temperature today (October 18, 2025). For more information and forecast for a few days, go to the weather forecast Union.

0-3 h	3-6 h	6-9 h	9-12 h
45.3°F	43.7°F	44.6°F	46.4°F

12-15 h	15-18 h	18-21 h	21-24 h
49.1°F	49.6°F	49.3°F	49.8°F

Union water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Union. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Union on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Union

The nearest beaches and cities from Union with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Hoodsport	49.1°F	50°F		0' 3"
Twanoh State Park	49.1°F	50°F		0' 3"
Gig Harbor	54°F	53.6°F		0' 1"
Brinnon	52°F	50°F		0' 3"
Seabeck	52°F	50°F		0' 3"
Hood Canal	52.2°F	50°F		0' 3"
Bremerton	52.7°F	50°F		0' 1"
Chico	52.7°F	50°F		0' 1"
Erlands Point Kitsap Lake	52.7°F	50°F		0' 1"
Navy Yard City	52.7°F	50°F		0' 1"

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Our report for Union is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.