Radyr Weather Forecast

    • 7
    • 8

    Heavy rain

    • 8
    • 10

    Heavy rain

    • 9
    • 13

    Heavy rain

    • 10
    • 12

    Cloudy

    • 9
    • 13

    Heavy rain

    • 7
    • 10

    Partly cloudy

    • 6
    • 10

    Cloudy

Today 5 Dec Wales

Cloud spilling across the region ahead of rain moving eastwards throughout the day, heavy at times. Windy with coastal gales developing. Chilly start but turning milder later. Maximum Temperature 11C.

Tonight 5 Dec Wales

Rain clearing to the northeast, leaving a mixture of clear spells and showers overnight. Showers will often be heavy, and may bring isolated hail and thunder. Winds easing somewhat inland but still blustery around coasts. A milder night than previous. Minimum Temperature 5C.

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Radyr Temperature Statistics

December Temperature

St-athan (17km)

  • Lowest 3 December, 2025

    2.5 °C

  • Average December

    8.6 °C

  • Highest 1 December, 2025

    13.3 °C

Climate (2020–Present)

St-athan (17km)

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  • Average Low 2020–2025

    8.8 °C

  • Average 2020–2025

    11.7 °C

  • Average High 2020–2025

    14.5 °C
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