Mountain Ash Weather Forecast

    • 12
    • 19

    Light rain

    • 9
    • 18

    Light rain

    • 9
    • 20

    Partly cloudy

    • 11
    • 21

    Sunny day

    • 14
    • 23

    Partly cloudy

    • 15
    • 24

    Partly cloudy

    • 14
    • 21

    Light rain shower

Today 20 Aug Wales

Some bright spells for a while first thing. However, showers spreading across the country as the day progresses, some of these being heavy with hail and thunder possible. A cooler northerly breeze developing. Maximum temperature 20 °C.

Tonight 20 Aug Wales

Showers reducing in number during the evening but some continuing overnight, chiefly around western coasts where they could still be heavy and thundery. A cool night with clear spells elsewhere. Minimum temperature 6 °C.

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Mountain Ash Temperature Statistics

August Temperature

St-athan (31km)

  • Lowest 7 August, 2026

    9.6 °C

  • Average August

    19.2 °C

  • Highest 12 August, 2026

    33.2 °C

Climate (2021–2026)

St-athan (31km)

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  • Average Low 2021–2026

    9 °C

  • Average 2021–2026

    11.9 °C

  • Average High 2021–2026

    14.8 °C
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