Old St Mellons Weather Forecast

    • 1
    • 5

    Sunny day

    • 3
    • 5

    Cloudy

    • 5
    • 7

    Sunny day

    • 3
    • 6

    Overcast

    • 3
    • 5

    Cloudy

    • 3
    • 6

    Overcast

Today 25 Dec Wales

Christmas Day will start quite cloudy again, but plenty of sunshine will develop during the day. It will remain blustery, with gales possible over hills. Feeling rather chilly. Maximum Temperature 5C.

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Old St Mellons Temperature Statistics

December Temperature

St-athan (26km)

  • Lowest 17 December, 2025

    1 °C

  • Average December

    9.2 °C

  • Highest 9 December, 2025

    15.2 °C

Climate (2020–Present)

St-athan (26km)

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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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