Treharris Weather Forecast

    • 11
    • 15

    Light rain

    • 8
    • 14

    Cloudy

    • 8
    • 14

    Light rain shower

    • 9
    • 14

    Light rain shower

    • 11
    • 15

    Heavy rain

    • 10
    • 17

    Cloudy

    • 11
    • 19

    Cloudy

Today 7 Jun Wales

A dry and bright start, but cloud will gradually build with some showery outbreaks of rain developing by lunchtime. This afternoon will then see a band of more persistent rain arriving from the west accompanied by a brisk breeze. Maximum temperature 18 °C.

Tonight 7 Jun Wales

A wet evening and night to come with the rain heavy and persistent at times, especially over the hills. Windy initially, although easing later in the night. Minimum temperature 11 °C.

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Treharris Temperature Statistics

June Temperature

St-athan (30km)

  • Lowest 5 June, 2026

    11.3 °C

  • Average June

    14 °C

  • Highest 3 June, 2026

    18 °C

Climate (2021–Present)

St-athan (30km)

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  • Average Low 2021–2026

    9 °C

  • Average 2021–2026

    11.8 °C

  • Average High 2021–2026

    14.7 °C
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