Heolgerrig Weather Forecast

    • 14
    • 21

    Cloudy

    • 15
    • 18

    Thunder

    • 13
    • 17

    Heavy rain

    • 12
    • 17

    Thunder shower

    • 12
    • 17

    Light rain

    • 12
    • 17

    Light rain shower

    • 13
    • 17

    Heavy rain

Today 27 Aug Wales

Heavy rain and thunderstorms will continue moving north through the day, with a risk of localised flooding. Intense downpours likely with the risk of hail. Some drier, brighter conditions will spread into the south later. Maximum temperature 25 °C.

Tonight 27 Aug Wales

A mostly dry evening with the odd shower that will ease overnight. Showers return during the early hours, mainly in the south. Staying mild for all. Minimum temperature 11 °C.

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Heolgerrig Temperature Statistics

August Temperature

St-athan (37km)

  • Lowest 7 August, 2026

    9.6 °C

  • Average August

    18.7 °C

  • Highest 12 August, 2026

    33.2 °C

Climate (2021–2026)

St-athan (37km)

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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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