Ireland weather in September 2025

Expect daytime maximum temperatures of 17°C in Ireland in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 15 days with some rainfall and typically 64 mm of rainfall in the month.

• 17
  17°C max day temperature
• 4
  4 hours of sunshine per day
• 15
  15 days with some rainfall
• 10
  10°C min night temperature
• 13
  13 hours of daylight per day
• 0
  No heat & humidity
• 64
  64 mm of monthly rainfall
• 4
  4 (Moderate) UV index
• 14
  14°C sea temperature

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The September weather guide for Ireland (Dublin) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Ireland destinations

Below are average maximum temperatures at popular countries, regions and places in Ireland in September. Select a holiday destination to see more weather parameters.

• 17
  Dublin
• 17
  Galway
• 17
  Limerick
• 16
  Cork

All Ireland destinations

• Achill Island
• Adare
• Ardara
• Arklow
• Athlone
• Ballina
• Ballinasloe
• Ballybofey
• Ballyliffin
• Banagher
• Bangor Erris
• Bantry
• Belmullet
• Boyle
• Buncrana
• Bundoran
• Cahir
• Carlow
• Carrick-On-Shannon
• Cashel
• Castlebar
• Castletownbere
• Catherdaniel
• Cavan
• Clifden
• Clonakilty
• Clonmel
• Cobh
• Cong
• Cork
• Dingle
• Donegal
• Doolin
• Downings
• Drogheda
• Dublin
• Dundalk
• Dungarvan
• Dunmore East
• Ennis
• Enniscorthy
• Enniskerry
• Fermoy
• Galway
• Glenbeigh
• Glendalough
• Glengariff
• Gougane Barra
• Gweedore
• Howth
• Inishbofin Island
• Kells
• Kenmare
• Kilkee
• Kilkenny
• Killaloe
• Killarney
• Killybegs
• Kilronan, Aran Islands
• Kinnitty
• Kinsale
• Lahinch
• Letterkenny
• Limerick
• Longford
• Mallow
• Mullingar
• Naas
• Navan
• Oughterard
• Portlaoise
• Redcastle
• Roscommon
• Roscrea
• Rosslare
• Schull
• Skibbereen
• Sligo
• Sneem
• Tralee
• Trim
• Tullamore
• Valentia Island
• Waterford
• Westport
• Wexford
• Wicklow

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Ireland

Ireland September sunrise & sunset times

Browse the sunrise and sunset times for Ireland in September 2025. Select a month to view Ireland sunrise and sunset times for the next 12 months. The Ireland sunrise and sunset times shown below are for Dublin.

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