Thornhill Weather Forecast

    • 12
    • 17

    Cloudy

    • 11
    • 20

    Cloudy

    • 13
    • 23

    Cloudy

    • 12
    • 23

    Sunny day

    • 13
    • 25

    Sunny day

    • 13
    • 25

    Sunny day

Today 20 May Wales

Largely cloudy at first on Wednesday, but some brighter spells developing at times. A few spots of rain possible where the cloud thickens. Maximum temperature 16 °C.

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Thornhill Temperature Statistics

May Temperature

St-athan (39km)

  • Lowest 15 May, 2026

    4.7 °C

  • Average May

    11.3 °C

  • Highest 9 May, 2026

    19.1 °C

Climate (2021–Present)

St-athan (39km)

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  • Average Low 2021–2026

    9 °C

  • Average 2021–2026

    11.8 °C

  • Average High 2021–2026

    14.6 °C
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