Merthyr Mawr Weather Forecast

    • 6
    • 19

    Sunny day

    • 5
    • 15

    Sunny day

    • 6
    • 14

    Sunny day

    • 6
    • 13

    Sunny day

    • 8
    • 12

    Cloudy

    • 8
    • 10

    Cloudy

    • 8
    • 10

    Light rain

Today 18 Mar Wales

After a chilly start, sunny skies are expected for many. Morning cloud towards the coasts and fog elsewhere should lift and break, allowing plenty of sunshine. Feeling warm. Light winds. Maximum temperature 21 °C.

Tonight 18 Mar Wales

Clear skies and light winds overnight leads to a risk of patchy mist and fog developing during the early hours of the morning. A colder night ahead with some frost. Minimum temperature 0 °C.

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Merthyr Mawr Temperature Statistics

March Temperature

St-athan (14km)

  • Lowest 14 March, 2026

    2.6 °C

  • Average March

    8.7 °C

  • Highest 2 March, 2026

    13.8 °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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