Flat Holm Island Weather Forecast

    • 6
    • 10

    Sunny day

    • 7
    • 10

    Partly cloudy

    • 8
    • 9

    Cloudy

    • 6
    • 9

    Cloudy

    • 5
    • 8

    Overcast

    • 4
    • 7

    Overcast

Today 19 Dec Wales

Friday brings a mixture of sunshine and scattered showers, these locally heavy. Fewer showers by the afternoon. Quite mild again but feeling cooler in the breeze, although winds easing later. Maximum Temperature 11C.

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Flat Holm Island Temperature Statistics

December Temperature

St-athan (22km)

  • Lowest 17 December, 2025

    1 °C

  • Average December

    9.4 °C

  • Highest 9 December, 2025

    15.2 °C

Climate (2020–Present)

St-athan (22km)

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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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