Merthyr Tydfil Weather Forecast

    • 7
    • 9

    Partly cloudy

    • 8
    • 10

    Cloudy

    • 5
    • 10

    Heavy rain

    • 1
    • 7

    Cloudy

    • 7
    • 9

    Heavy rain

    • 5
    • 10

    Heavy rain

Today 13 Dec Wales

Bright to begin the weekend, though sunshine turning hazier through the day as cloud builds. Winds strengthening with coastal gales developing around Anglesey by evening. Dry during daylight hours. Maximum Temperature 11C.

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Merthyr Tydfil Temperature Statistics

December Temperature

Sennybridge (38km)

  • Lowest 4 December, 2025

    -0.2 °C

  • Average December

    7.8 °C

  • Highest 9 December, 2025

    12.9 °C

Climate (2020–Present)

Sennybridge (38km)

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  • Average Low 2020–2025

    5.5 °C

  • Average 2020–2025

    9.2 °C

  • Average High 2020–2025

    12.7 °C
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