Sully Island Weather Forecast

    • 10
    • 14

    Light rain

    • 8
    • 12

    Sunny day

    • 8
    • 11

    Cloudy

    • 7
    • 10

    Cloudy

    • 10
    • 11

    Partly cloudy

    • 10
    • 12

    Light rain

Today 9 Dec Wales

Mainly cloudy with outbreaks of rain and drizzle through the morning, heavy over higher ground at first. Brightening up through the afternoon. Severe gales easing but staying windy. Exceptionally mild. Maximum Temperature 16C.

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Sully Island Temperature Statistics

December Temperature

St-athan (16km)

  • Lowest 5 December, 2025

    1.8 °C

  • Average December

    8.9 °C

  • Highest 1 December, 2025

    13.3 °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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