This data the coastal Gwynneville 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.
Water temperature in Gwynneville today is 18°C. Based on our historical data over a period of ten years, the warmest water in this day in Gwynneville was recorded in 2013 and was 17.9°C, and the coldest was recorded in 2008 at 15.6°C. Sea water temperature in Gwynneville is expected to drop to 17.4°C in the next 10 days. September average water temperature in Gwynneville is 17.3°C, the minimum temperature is 15.2°C, and the maximum is 19.5°C.
The swimming season in Gwynneville lasts from November to May. During those months, Gwynneville water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Gwynneville in winter reaches 17.9°C, in spring 18.5°C, in summer the average temperature rises to 22.1°C, and in autumn it is 21.8°C.
5 September 2025 |
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today temp |
18°C |
4 September 2025 |
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yesterday temp |
18.6°C |
The ocean salinity in Gwynneville is 35.31‰, and the average salinity of the World Ocean is 35‰.
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 Gwynneville. 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 Gwynneville. Data in table shown for 5 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
3' 3" | 3' 1" | 2' 9" | 2' 7" |
1 m | 0.93 m | 0.84 m | 0.79 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
2' 5" | 2' 4" | 2' 4" | 2' 4" |
0.73 m | 0.71 m | 0.71 m | 0.7 m |
Data in a table show Gwynneville temperature today (5 September 2025). For more information and forecast for a few days, go to the weather forecast Gwynneville.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
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11.4°C | 10.4°C | 9.2°C | 14.4°C |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
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14.2°C | 13.6°C | 11.5°C | 11.2°C |
You may also be interested in other sections of our site for Gwynneville: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly sea temperature in Gwynneville. 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 Gwynneville 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
Month | Avr | Min | Max | |
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January | 22.4°C | 20°C | 24.5°C | warm |
Ocean water temperature in Gwynneville in January | ||||
February | 23.1°C | 21.1°C | 25.3°C | warm |
Ocean water temperature in Gwynneville in February | ||||
March | 22.9°C | 20.5°C | 24.6°C | warm |
Ocean water temperature in Gwynneville in March | ||||
April | 21.8°C | 19.5°C | 24.5°C | warm |
Ocean water temperature in Gwynneville in April | ||||
May | 20.6°C | 18.3°C | 23.1°C | warm |
Ocean water temperature in Gwynneville in May | ||||
June | 19°C | 17.1°C | 21.2°C | cold |
Ocean water temperature in Gwynneville in June | ||||
July | 17.7°C | 16°C | 19.9°C | cold |
Ocean water temperature in Gwynneville in July | ||||
August | 17.1°C | 15°C | 19.4°C | cold |
Ocean water temperature in Gwynneville in August | ||||
September | 17.3°C | 15.2°C | 19.5°C | cold |
Ocean water temperature in Gwynneville in September | ||||
October | 18.5°C | 16.2°C | 20.6°C | cold |
Ocean water temperature in Gwynneville in October | ||||
November | 19.7°C | 17.7°C | 21.8°C | cold |
Ocean water temperature in Gwynneville in November | ||||
December | 20.9°C | 17.1°C | 23.8°C | warm |
Ocean water temperature in Gwynneville in December |