Treharris Weather Forecast

    • 15
    • 25

    Sunny day

    • 17
    • 29

    Sunny day

    • 15
    • 29

    Sunny day

    • 13
    • 25

    Sunny day

    • 13
    • 24

    Sunny day

    • 12
    • 22

    Cloudy

    • 12
    • 21

    Cloudy

Today 24 May Wales

Any fog quickly clearing, then sunny and very warm for most with light winds. Fresher on Irish Sea coasts with a small chance of sea mist at times. Maximum temperature 26 °C.

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Treharris Temperature Statistics

May Temperature

St-athan (30km)

  • Lowest 15 May, 2026

    4.7 °C

  • Average May

    12 °C

  • Highest 21 May, 2026

    21.7 °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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