Castledawson Weather Forecast

    • 12
    • 17

    Cloudy

    • 9
    • 16

    Cloudy

    • 12
    • 16

    Cloudy

    • 15
    • 20

    Cloudy

    • 11
    • 18

    Light rain

    • 11
    • 15

    Partly cloudy

    • 12
    • 16

    Light rain

Today 18 Sep Northern Ireland

A dry start in the east but rain in the west will spread east during the morning. Rain will turn light and patchy in the afternoon. Drier in the west later, quite a breezy day. Maximum temperature 17 °C.

Tonight 18 Sep Northern Ireland

Some clear spells developing as cloud breaks but still a few showers moving across the province in the fresh westerly winds. Minimum temperature 9 °C.

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Castledawson Temperature Statistics

September Temperature

Lough Fea Samos (17km)

  • Lowest 9 September, 2026

    10.1 °C

  • Average September

    14.8 °C

  • Highest 2 September, 2026

    20.7 °C

Climate (2021–2026)

Lough Fea Samos (17km)

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  • Average Low 2021–2026

    6.6 °C

  • Average 2021–2026

    9.4 °C

  • Average High 2021–2026

    12.3 °C
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