Sully Island Weather Forecast

    • 9
    • 14

    Light rain

    • 11
    • 13

    Heavy rain

    • 12
    • 15

    Light rain shower

    • 12
    • 15

    Cloudy

    • 12
    • 18

    Cloudy

    • 13
    • 19

    Partly cloudy

    • 13
    • 18

    Partly cloudy

Today 17 May Wales

A bright start but cloud will quickly bubble up allowing a few showers to develop by lunchtime. Showers then becoming increasingly frequent and heavier later in the day. Feeling a little less cool but temperatures still below average. Maximum temperature 15 °C.

Tonight 17 May Wales

Scattered showers continuing overnight with some clearer spells in between. Showers perhaps becoming more organised and heavier later during the early hours. Turning chilly in the countryside but mainly frost-free. Minimum temperature 6 °C.

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Sully Island Temperature Statistics

May Temperature

St-athan (16km)

  • Lowest 15 May, 2026

    4.7 °C

  • Average May

    11.3 °C

  • Highest 9 May, 2026

    19.1 °C

Climate (2021–Present)

St-athan (16km)

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  • Average Low 2021–2026

    9 °C

  • Average 2021–2026

    11.8 °C

  • Average High 2021–2026

    14.6 °C
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