Thornhill Weather Forecast

    • 12
    • 21

    Cloudy

    • 10
    • 20

    Cloudy

    • 10
    • 18

    Partly cloudy

    • 10
    • 19

    Light rain shower

    • 13
    • 18

    Partly cloudy

    • 16
    • 21

    Cloudy

Today 24 Sep Wales

Hazy sunny spells through much of Thursday and staying dry for all. Brighter sunshine later. Light winds with temperatures around, or just above average for the time of year. Maximum temperature 21 °C.

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Thornhill Temperature Statistics

September Temperature

St-athan (39km)

  • Lowest 10 September, 2026

    10.1 °C

  • Average September

    16.7 °C

  • Highest 6 September, 2026

    25.1 °C

Climate (2021–2026)

St-athan (39km)

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  • Average Low 2021–2026

    9.1 °C

  • Average 2021–2026

    12 °C

  • Average High 2021–2026

    14.8 °C
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