Flat Holm Island Weather Forecast

    • 19
    • 30

    Sunny day

    • 16
    • 30

    Sunny day

    • 15
    • 25

    Sunny day

    • 14
    • 23

    Sunny day

    • 13
    • 19

    Cloudy

    • 14
    • 19

    Cloudy

Today 25 May Wales

Hot and humid on bank holiday Monday, exceptionally so for late May, with widespread strong sunshine and light winds. Slightly fresher at the coast with a sea breeze. Maximum temperature 30 °C.

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Flat Holm Island Temperature Statistics

May Temperature

St-athan (22km)

  • Lowest 15 May, 2026

    4.7 °C

  • Average May

    12 °C

  • Highest 21 May, 2026

    21.7 °C

Climate (2021–Present)

St-athan (22km)

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  • Average Low 2021–2026

    9 °C

  • Average 2021–2026

    11.8 °C

  • Average High 2021–2026

    14.7 °C
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