Merthyr Tydfil Weather Forecast

    • 12
    • 16

    Cloudy

    • 16
    • 17

    Heavy rain

    • 15
    • 18

    Light rain

    • 13
    • 18

    Light rain

    • 9
    • 16

    Light rain shower

    • 7
    • 13

    Light rain shower

    • 7
    • 13

    Cloudy

Today 16 Sep Wales

A drier day albeit still the chance of a few isolated showers. Sunny spells are likely through the morning, but any sunshine turning hazy through the afternoon. Still breezy. Maximum Temperature 17C.

Tonight 16 Sep Wales

Cloudy this evening then turning increasingly wet and windy overnight with a band of heavy and persistent rain pushing eastwards. Rain most persistent over the mountains, with flooding possible. Mild overnight. Minimum Temperature 11C.

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Merthyr Tydfil Temperature Statistics

September Temperature

Sennybridge (38km)

  • Lowest 14 September, 2025

    7 °C

  • Average September

    12.3 °C

  • Highest 6 September, 2025

    19.2 °C

Climate (2020–Present)

Sennybridge (38km)

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  • Average Low 2020–2025

    5.5 °C

  • Average 2020–2025

    9.1 °C

  • Average High 2020–2025

    12.6 °C
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