Sully Island Weather Forecast

    • 4
    • 11

    Partly cloudy

    • 9
    • 10

    Cloudy

    • 10
    • 11

    Cloudy

    • 8
    • 11

    Cloudy

    • 5
    • 10

    Cloudy

    • 8
    • 10

    Cloudy

Today 12 Dec Wales

Rain gradually clearing during the morning to leave a dry and sunny day for many, though cloud may linger in the east. Winds lighter than of late but feeling fresher. Maximum Temperature 11C.

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Sully Island Temperature Statistics

December Temperature

St-athan (16km)

  • Lowest 5 December, 2025

    1.8 °C

  • Average December

    10 °C

  • Highest 9 December, 2025

    15.2 °C

Climate (2020–Present)

St-athan (16km)

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  • Average Low 2020–2025

    8.8 °C

  • Average 2020–2025

    11.7 °C

  • Average High 2020–2025

    14.5 °C
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