Old St Mellons Weather Forecast

    • 16
    • 30

    Sunny day

    • 14
    • 26

    Cloudy

    • 12
    • 19

    Partly cloudy

    • 14
    • 19

    Cloudy

    • 15
    • 18

    Cloudy

    • 14
    • 18

    Light rain

    • 13
    • 17

    Light rain shower

Today 27 May Wales

Another dry and sunny day, although there is a small chance of the odd shower developing and perhaps a few thunderstorms later. Not as hot but still feeling very warm. Maximum temperature 30 °C.

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Old St Mellons Temperature Statistics

May Temperature

St-athan (26km)

  • Lowest 15 May, 2026

    4.7 °C
  • Average May

    12.5 °C
  • Highest 24 May, 2026

    25.9 °C

Climate (2021–Present)

St-athan (26km)

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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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