Merthyr Mawr Weather Forecast

    • 16
    • 19

    Cloudy

    • 16
    • 18

    Light rain

    • 14
    • 18

    Cloudy

    • 14
    • 18

    Partly cloudy

    • 15
    • 19

    Sunny day

    • 16
    • 19

    Partly cloudy

Today 4 Jul Wales

Some early sunshine, before turning increasingly cloudy through the day. Mostly dry, though spells of rain spreading into northern parts later, and becoming breezy here too. Maximum Temperature 21C.

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Merthyr Mawr Temperature Statistics

July Temperature

St-athan (14km)

  • Lowest 2 July, 2025

    14.3 °C

  • Average July

    17.3 °C

  • Highest 1 July, 2025

    21 °C

Climate (2020–Present)

St-athan (14km)

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  • Average Low 2020–2025

    8.7 °C

  • Average 2020–2025

    11.6 °C

  • Average High 2020–2025

    14.4 °C
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