Sully Island Weather Forecast

    • 14
    • 18

    Cloudy

    • 18
    • 22

    Cloudy

    • 13
    • 20

    Partly cloudy

    • 14
    • 18

    Partly cloudy

    • 14
    • 18

    Light rain shower

    • 12
    • 19

    Cloudy

Today 28 Sep Wales

A dry day on Monday with light winds and prolonged spells of sunshine. Chilly at first, but warm in the afternoon. Sunshine turning hazy at times. Maximum temperature 19 °C.

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Sully Island Temperature Statistics

September Temperature

St-athan (16km)

  • Lowest 26 September, 2026

    8.9 °C

  • Average September

    16.5 °C

  • Highest 6 September, 2026

    25.1 °C

Climate (2021–2026)

St-athan (16km)

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  • Average Low 2021–2026

    9.1 °C

  • Average 2021–2026

    12 °C

  • Average High 2021–2026

    14.8 °C
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