Merthyr Mawr Weather Forecast

    • 5
    • 15

    Sunny day

    • 6
    • 13

    Cloudy

    • 9
    • 11

    Cloudy

    • 7
    • 11

    Light rain

    • 7
    • 9

    Light rain shower

    • 8
    • 10

    Cloudy

    • 7
    • 10

    Light rain

Today 21 Mar Wales

A chilly start with some patches of mist and fog. This gradually breaking up through the morning to leave a fine day with plenty of sunshine, this a little hazy at times. Light winds and feeling pleasant in the sunshine. Maximum temperature 16 °C.

Tonight 21 Mar Wales

A settled evening to come with clear spells into the night. Turning chilly, with a few mist and fog patches developing and a touch of frost in rural spots. Minimum temperature 2 °C.

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Merthyr Mawr Temperature Statistics

March Temperature

St-athan (14km)

  • Lowest 14 March, 2026

    2.6 °C

  • Average March

    8.9 °C

  • Highest 18 March, 2026

    17.9 °C

Climate (2021–2026)

St-athan (14km)

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  • Average Low 2021–2026

    8.9 °C

  • Average 2021–2026

    11.8 °C

  • Average High 2021–2026

    14.6 °C
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