Castlereagh Weather Forecast

    • 13
    • 16

    Light rain

    • 11
    • 16

    Cloudy

    • 11
    • 15

    Partly cloudy

    • 13
    • 16

    Light rain

    • 12
    • 16

    Light rain shower

    • 13
    • 16

    Cloudy

    • 14
    • 19

    Cloudy

Today 15 Sep Northern Ireland

Bright spells and scattered showers, these heaviest in the morning with a chance of thunder. Best of the brightness in the southeast. Maximum temperature 17 °C.

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Castlereagh Temperature Statistics

September Temperature

Aldergrove (23km)

  • Lowest 9 September, 2026

    10.1 °C

  • Average September

    14.9 °C

  • Highest 2 September, 2026

    20.7 °C

Climate (2021–2026)

Aldergrove (23km)

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  • Average Low 2021–2026

    7.5 °C

  • Average 2021–2026

    10.4 °C

  • Average High 2021–2026

    13.4 °C
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