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Temperature in Ireland in September

September in Ireland has maximum daytime temperatures ranging from moderate in Greencastle with 16°C to pleasant temperatures in Drogheda with 18°C. Nighttime temperatures generally drop to 11°C in Drogheda and 12°C in Greencastle.

What is the temperature of the different cities in Ireland in September?

Find the average daytime temperatures in September for the most popular destinations in Ireland on the map below. Click on a destination dot for more detailed information.

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Legend very warm warm pleasant moderate cold very cold
Very warm means maximum temperatures above 30°C. Warm: 22°C to 30°C. Pleasant: 18°C to 22°C Moderate: 12°C to 18°C. Cold: 2°C to 12°C. Very cold: lower than 2°C

  • What is the warmest city in September in Ireland?
  • Drogheda tops the warmest city list in our database with average maximum daytime temperatures around 18°C and a minimum nighttime temperature of around 11°C.

  • What is the coldest city in September in Ireland?
  • In our database, Greencastle is the chilliest city in September in Ireland. Daytime temperatures typically peak at 16°C, while the nighttime lows hover around 12°C.

  • How much sun does Ireland get in September?
  • Dublin enjoys a balanced 128 hours of sunlight. This makes it neither too overcast nor too sunny.

  • What is the water's temperature in September?
  • The water temperature averages approximately 15°C in Cork this month, so not the best month to swim.

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