Castledawson Weather Forecast

    • 7
    • 15

    Light rain shower

    • 12
    • 15

    Light rain

    • 11
    • 15

    Heavy rain shower

    • 10
    • 16

    Cloudy

    • 11
    • 17

    Cloudy

    • 8
    • 16

    Cloudy

Today 13 Sep Northern Ireland

A dry start in the east but a few showers in the west. Then it will be a mostly cloudy day with scattered showers, occasionally by afternoon. Rather cool. Maximum Temperature 16C.

Tonight 13 Sep Northern Ireland

Showers will gradually die out this evening. Otherwise it will be a dry night with lengthy clear periods. Becoming cold with a slight frost in some sheltered glens. Minimum Temperature 4C.

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Castledawson Temperature Statistics

September Temperature

Lough Fea Samos (17km)

  • Lowest 8 September, 2025

    7.6 °C

  • Average September

    12.1 °C

  • Highest 7 September, 2025

    16.4 °C

Climate (2020–Present)

Lough Fea Samos (17km)

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  • Average Low 2020–2025

    6.3 °C

  • Average 2020–2025

    9.2 °C

  • Average High 2020–2025

    12 °C
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