Merthyr Mawr Weather Forecast

    • 10
    • 14

    Light rain

    • 11
    • 12

    Light rain

    • 12
    • 16

    Heavy rain

    • 12
    • 13

    Partly cloudy

    • 13
    • 17

    Heavy rain

    • 12
    • 14

    Light rain shower

    • 12
    • 14

    Cloudy

Today 22 Oct Wales

Patchy cloud and isolated showers to start, with fog over northern hills. Showers slowly dying out to leave a dry afternoon with sunny spells, before Storm Austen brings rain to the south coast by evening. Maximum temperature 15 °C.

Tonight 22 Oct Wales

Heavy rain and hill fog pushes northeastwards with Storm Austen. Gusty over high ground overnight, then gales reach the southwest of the country around dawn. Minimum temperature 6 °C.

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Merthyr Mawr Temperature Statistics

October Temperature

St-athan (14 km)

  • Lowest 17 October, 2026

    5.4 °C

  • Average October

    13.6 °C

  • Highest 2 October, 2026

    20.3 °C

Climate (2021–2026)

St-athan (14 km)

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  • Average Low 2021–2026

    9.1 °C

  • Average 2021–2026

    12 °C

  • Average High 2021–2026

    14.8 °C
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