Porthmadog Sea Temperature

(Today) 2025

9.6°C / 49.3°F

The water will feel cold. All but the most ardent watersports enthusiasts will be thinking of packing up for the winter. If not we'd suggest a thick 5/4mm wetsuit along with some boots and a hood.

*Live data from Rhyl Flats: 46.2°C / 115.2°F

Current weather

9°C / 48°F
(light rain)
Partly cloudy
Wind
19 mph
Humidity
85%

The measurements for the water temperature in Porthmadog, Wales 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 Porthmadog water temperature derived from many years of historical sea surface temperature data.

Porthmadog average maximum / minimum water temperatures
Maximum and minimum monthly sea temperatures in Porthmadog
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 7.6 7.4 7.6 8.3 9.6 11.3 12.7 14.5 14.8 13.4 12 9.2
Max °C 10 9.7 8.9 10.2 11.7 13.9 15.8 16 16.1 15.4 14.3 12.6
Min °F 46.6 46.2 46.2 47.7 50.1 53.4 56.1 58.7 59.1 56.9 54.5 49.9
Max °F 49 48.5 47.5 49.6 52.2 56 59.2 60.2 60.4 58.9 56.8 53.3

The warmest water temperature is in September with an average around 59.7°F / 15.4°C. The coldest month is March with an average water temperature of 46.8°F / 8.2°C.

7 day tide forecast for Porthmadog

MonTueWedThuFriSatSun
  • Low 04:39am
    (0.75m)
  • High 10:07am
    (5.01m)
  • Low 04:56pm
    (0.78m)
  • High 10:22pm
    (4.97m)
  • Low 05:10am
    (0.79m)
  • High 10:34am
    (4.92m)
  • Low 05:25pm
    (0.86m)
  • High 10:48pm
    (4.9m)
  • Low 05:40am
    (0.88m)
  • High 11:01am
    (4.78m)
  • Low 05:55pm
    (1m)
  • High 11:16pm
    (4.75m)
  • Low 06:12am
    (1.05m)
  • High 11:28am
    (4.56m)
  • Low 06:24pm
    (1.2m)
  • High 11:44pm
    (4.53m)
  • Low 06:45am
    (1.27m)
  • High 11:58am
    (4.28m)
  • Low 06:57pm
    (1.44m)
  • High 12:16am
    (4.26m)
  • Low 07:22am
    (1.52m)
  • High 12:32pm
    (3.95m)
  • Low 07:37pm
    (1.71m)
  • High 12:54am
    (3.93m)
  • Low 08:12am
    (1.77m)
  • High 01:18pm
    (3.6m)
  • Low 08:32pm
    (1.97m)
  • High 01:48am
    (3.63m)
7 day tide times for Porthmadog

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