Merthyr Dyfan Weather Forecast

    • 2
    • 8

    Light rain

    • 8
    • 9

    Light rain

    • 9
    • 11

    Heavy rain shower

    • 8
    • 12

    Heavy rain

    • 10
    • 11

    Cloudy

    • 10
    • 13

    Cloudy

Today 4 Dec Wales

Rain clearing to the northeast. Some brighter spells in the south and west, and a day of sunshine and scattered showers generally unfolding. Overnight, frost and fog patches may form. Maximum Temperature 8C.

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Merthyr Dyfan Temperature Statistics

December Temperature

St-athan (11km)

  • Lowest 2 December, 2025

    8.1 °C

  • Average December

    10 °C

  • Highest 1 December, 2025

    13.3 °C

Climate (2020–Present)

St-athan (11km)

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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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