Merthyr Mawr Weather Forecast

    • 15
    • 22

    Cloudy

    • 13
    • 22

    Partly cloudy

    • 14
    • 20

    Sunny day

    • 16
    • 20

    Sunny day

    • 16
    • 20

    Cloudy

    • 17
    • 21

    Cloudy

Today 19 Aug Wales

Cloud will be slow to lift through the morning, however brighter breaks will arrive from the west. Warm, sunny spells by the afternoon, however showers may linger across the south. Maximum Temperature 23C.

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Merthyr Mawr Temperature Statistics

August Temperature

St-athan (14km)

  • Lowest 2 August, 2025

    10.2 °C

  • Average August

    18.5 °C

  • Highest 12 August, 2025

    31.3 °C

Climate (2020–Present)

St-athan (14km)

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  • Average Low 2020–2025

    8.8 °C

  • Average 2020–2025

    11.6 °C

  • Average High 2020–2025

    14.5 °C
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