Treharris Weather Forecast

    • 16
    • 29

    Sunny day

    • 16
    • 29

    Thunder shower

    • 16
    • 26

    Partly cloudy

    • 13
    • 20

    Light rain shower

    • 12
    • 18

    Light rain shower

    • 14
    • 21

    Cloudy

    • 14
    • 22

    Partly cloudy

Today 11 Jul Wales

Early morning mist and fog will soon burn back to the coasts leaving another widely fine, settled day. Very warm or hot inland with lengthy spells of sunshine, though feeling a little cooler and more comfortable along the west coast. Maximum Temperature 28C.

Tonight 11 Jul Wales

Warm with widely clear skies this evening and overnight, allowing some patchy mist and sea fog to return by dawn. Feeling muggy, rather uncomfortable for sleeping. Minimum Temperature 15C.

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Treharris Temperature Statistics

July Temperature

St-athan (30km)

  • Lowest 3 July, 2025

    10.6 °C

  • Average July

    17 °C

  • Highest 9 July, 2025

    22.9 °C

Climate (2020–Present)

St-athan (30km)

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  • Average Low 2020–2025

    8.7 °C

  • Average 2020–2025

    11.6 °C

  • Average High 2020–2025

    14.4 °C
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