Water temperature in Southampton (Hampshire)

This data the coastal Southampton sea 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 sea temperature in Southampton

Water temperature in Southampton today is 16.5°C. Based on our historical data over a period of ten years, the warmest water in this day in Southampton was recorded in 2021 and was 18.7°C, and the coldest was recorded in 2012 at 15.7°C. Sea water temperature in Southampton is expected to drop to 16°C in the next 10 days. September average water temperature in Southampton is 17.6°C, the minimum temperature is 15.6°C, and the maximum is 20.5°C.

The swimming season in Southampton lasts only one month - August. During this month, Southampton water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Southampton in winter reaches 8.3°C, in spring 10.1°C, in summer the average temperature rises to 17.6°C, and in autumn it is 15.1°C.

Southampton water temperature now

The sea salinity in Southampton is 33.22‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Southampton 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 Southampton. 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 Southampton. Data in table shown for 26 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Southampton

Southampton weather forecast

Current temperature and weather

Data in a table show Southampton temperature today (26 September 2025). For more information and forecast for a few days, go to the weather forecast Southampton.

0-3 h	3-6 h	6-9 h	9-12 h
9.4°C	8.1°C	8.5°C	12.6°C

12-15 h	15-18 h	18-21 h	21-24 h
15.1°C	14.1°C	12.5°C	12.2°C

Southampton water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Southampton. 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 Southampton 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 Southampton

The nearest beaches and cities from Southampton 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
Freemantle	16.5°C	14°C		0.1 m
Hamble-le-Rice	16.5°C	14°C		0.1 m
Hythe	16.5°C	14°C		0.1 m
Totton	16.5°C	14°C		0.1 m
Warsash	16.5°C	14°C		0.1 m
Cowes	16.5°C	14°C		0.1 m
East Cowes	16.5°C	14°C		0.1 m
Calshot	16.5°C	14°C		0.1 m
Fareham	16.5°C	14°C		0.28 m
Gurnard	16.6°C	14°C		0.1 m

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Our report for Southampton 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.