St Mellons Weather Forecast

    • 6
    • 9

    Sunny day

    • 8
    • 9

    Cloudy

    • 6
    • 9

    Overcast

    • 5
    • 8

    Overcast

    • 3
    • 6

    Overcast

    • 3
    • 5

    Partly cloudy

Today 20 Dec Wales

A largely fine day with sunny periods. Freshening southeasterly winds developing and turning windier in the west with some rain possible in Pembrokeshire later. Feeling cooler. Maximum Temperature 9C.

Tonight 20 Dec Wales

Becoming cloudier overnight with some spots of rain. Winds mostly easing but still fairly breezy around exposed coasts. Not turning quite as chilly as previous nights. Minimum Temperature 5C.

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St Mellons Temperature Statistics

December Temperature

St-athan (27km)

  • Lowest 17 December, 2025

    1 °C

  • Average December

    9.6 °C

  • Highest 9 December, 2025

    15.2 °C

Climate (2020–Present)

St-athan (27km)

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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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