Castlereagh Weather Forecast

    • 5
    • 6

    Cloudy

    • 4
    • 6

    Sunny day

    • 5
    • 7

    Cloudy

    • 3
    • 7

    Overcast

    • 2
    • 5

    Overcast

    • 1
    • 6

    Fog

    • 3
    • 6

    Cloudy

Today 25 Dec Northern Ireland

Dry and mainly bright on Christmas Day with some weak winter sunshine. Some cloudier spells perhaps filtering in from the Irish Sea, mostly likely affecting Counties Down and Armagh. Maximum Temperature 6C.

Tonight 25 Dec Northern Ireland

Dry with the best of the clear skies towards the north and west leading to a frost and a few freezing fog patches. Cloudier skies at times in the east. Minimum Temperature -2C.

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Castlereagh Temperature Statistics

December Temperature

Aldergrove (23km)

  • Lowest 16 December, 2025

    0.3 °C

  • Average December

    7.5 °C

  • Highest 9 December, 2025

    14.6 °C

Climate (2020–Present)

Aldergrove (23km)

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  • Average Low 2020–2025

    7.4 °C

  • Average 2020–2025

    10.3 °C

  • Average High 2020–2025

    13.3 °C
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