Alderney Sea Temperature

(Today) 2025

16.6°C / 61.8°F

The water will feel medium. The water will feel a bit chilly in just bathers / swimming costume. If you plan on wearing a wetsuit 4/3mm should be thick enough.

Current weather

20°C / 69°F
(clear sky)
Partly cloudy
Wind
13 mph
Humidity
73%

The measurements for the water temperature in Alderney, England are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.

*Live data may vary from satellite readings for a number of reasons. These include local factors, depth of smapling and time of day.

Water temp by month

Monthly average max / min water temperatures

The graph below shows the range of monthly Alderney water temperature derived from many years of historical sea surface temperature data.

Alderney average maximum / minimum water temperatures
Maximum and minimum monthly sea temperatures in Alderney
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 8.6 8.5 8 9.1 10.4 11.7 14.3 15.8 15.9 15.2 13.1 10.8
Max °C 12.1 11.1 10.8 11.5 13 15.7 17 18.1 18 17.1 15.7 13.6
Min °F 48.8 48.3 47.5 49.3 51.8 54.7 58.8 61.3 61.4 60.1 56.6 52.6
Max °F 52.3 50.9 50.3 51.7 54.4 58.7 61.5 63.6 63.5 62 59.2 55.4

The warmest water temperature is in August with an average around 62.4°F / 16.9°C. The coldest month is March with an average water temperature of 48.9°F / 9.4°C.

7 day tide forecast for Alderney

SatSunMonTueWedThuFri
  • Low 03:05am
    (1.23m)
  • High 08:57am
    (5.72m)
  • Low 03:23pm
    (1.37m)
  • High 09:16pm
    (5.96m)
  • Low 03:50am
    (1.09m)
  • High 09:36am
    (5.82m)
  • Low 04:08pm
    (1.28m)
  • High 10:03pm
    (6.02m)
  • Low 04:34am
    (1.02m)
  • High 10:25am
    (5.86m)
  • Low 04:52pm
    (1.27m)
  • High 10:42pm
    (6m)
  • Low 05:17am
    (1.05m)
  • High 11:04am
    (5.82m)
  • Low 05:33pm
    (1.34m)
  • High 11:21pm
    (5.92m)
  • Low 06:00am
    (1.19m)
  • High 11:43am
    (5.67m)
  • Low 06:17pm
    (1.49m)
  • High 12:02am
    (5.73m)
  • Low 06:45am
    (1.4m)
  • High 12:25pm
    (5.51m)
  • Low 07:03pm
    (1.7m)
  • High 12:47am
    (5.52m)
  • Low 07:34am
    (1.67m)
  • High 01:13pm
    (5.32m)
  • Low 07:58pm
    (1.94m)
7 day tide times for Alderney

*These tide times are estimates based on the nearest accurate location (St. Helier, Jersey, Channel Islands) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.