September Weather in Ireland: Average Temperatures, Daylight, and Rainfall

Beautifull wild landscape of Cliffs of Moher in Ireland. Hiking trip on summer holidays.
© Lyd Photography/

Written by Patrick MacFarland

Updated: August 26, 2023

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Ireland is known as the Emerald Isle. It’s a beautiful country filled with green landscapes that will leave you in awe. Ireland is also known as a rainy country, much like Great Britain, its neighbor to the east. If you plan on visiting Ireland in September, you are just in luck. You will see the last of the summer tourists. When it comes to rain, September is a good month to visit.

Let’s take a look at Ireland’s weather in September and highlight the average temperatures and what to expect in terms of precipitation. If you plan on visiting the Emerald Isle in September, we’ll highlight fun things to do and other fun facts.

Average Temperature

Modern buildings and offices on Liffey river in Dublin on a bright sunny day

The capital of Ireland, Dublin means Black Pool in Irish Gaelic.


The World Bank’s Climate Change Knowledge Portal has been tracking the weather in Ireland for a hundred years. The average temperature in September ranges from a high of about 60 degrees Fahrenheit (15 degrees Celsius) to a low of about 50 degrees Fahrenheit (10 degrees Celsius). The west part of Ireland usually has colder temperatures than Dublin or the east part of the country. Sunrise is approximately at 6:41 AM and sunset is at 8:14 PM, giving you 14 hours of daylight to tourist around.

The Hottest Temperature on Record

With climate change in full force, we know the earth has been getting hotter each year. In fact, according to The Irish Times, the year 2021 broke the record for the hottest September in Irish history. It will only get hotter over time. However, when it comes to records, the hottest temperature happened on September 6, 1868, with a whopping 80 degrees Fahrenheit (27 degrees Celsius). 

The Coldest Temperature on Record

As the hotter months get hotter, the colder months will get colder. That’s how the world is changing climatically. The weather in September is usually one that doesn’t hold records — both in the hottest and coldest categories. However, it was reported that the coldest temperature for September happened on September 19, 1986. It was 32 degrees Fahrenheit (0 degrees Celsius) that day.

Average Rainfall in September

Ireland is a pretty rainy country. Due to climate change, rainfall has been slowly diminishing, especially in the summer. In a report featured in the Weather Journal, there was an analysis that concluded that Ireland had experienced a severe drought in 2018. Luckily, the last few years have been plentiful in rain.

On average, September has 12 rainy days and about 2-4 inches of rainfall in the month. That ensures you with sunny days for most of the month. The upside of having rain and sun on the same day is the chance of seeing a rainbow. Just don’t go chasing the end of a rainbow, like leprechauns do!

UV Index in September

Rainbow over Dublin

Dublin’s weather in September is pleasant with about twelve days of rain in the month.


As mentioned above, the earth is experiencing detrimental levels of climate change. One of the environmental effects is the ozone layer’s depletion. Even though, reports conclude that the ozone layer is recovering, sun damage is still a concern for many humans. Wearing sunscreen is a needed thing before leaving the house. In September, the UV Index in September is at a 4. This means there is a moderate vulnerability to sun exposure. 

Although the average is between a 3 to a 5 during September, which isn’t too bad for the skin, it is still recommended to wear sunscreen and wear a hat to protect yourself from the sun’s rays. 

Natural Disasters in September

There aren’t many natural disasters in September, however, in recent years, there have been a few. The year 2020 was quite a traumatic year for the Irish. Besides the COVID-19 pandemic, which hit the entire world in March 2020 and continued for several years, there were two other natural disasters.

In September 2020, there were flash floods in County Galway. Homes were evacuated because of the flood risk. Later that month, there was an earthquake in the Irish Sea near Dublin. In September 2008, because of heavy rain, there were big slides that engulfed two bridges near County Kerry.

Visiting Ireland in September

Aerial birds eye drone view from the world famous cliffs of moher in county clare ireland. Scenic Irish rural countryside nature along the wild atlantic way and European Atlantic Geotourism Route

Located in the province of Munster, the Cliffs of Moher contains more than 1,000 species of flora and fauna.


There are many sights to see in Ireland, especially in September when the weather is beginning to get slightly crisper. When you go to Dublin, visit Trinity College and St. Patrick’s Cathedral. Walk around St. Stephen’s Green and then pop in at a local Irish pub. If you’d like to go castle hunting, go to Cork and check out the Rock of Cashel, an archaeological site with many medieval buildings. You can also go to Blarney Castle to kiss the Blarney Stone. According to legend, if you kissed the Blarney stone, you would be provided with eloquence.

For those nature lovers out there, there is no shortage of outdoor activities in Ireland. You can bike anywhere and take trails to explore nearby castles or lakes. You can also hike up Carrauntoohil, the highest mountain in Ireland. If you love the water, you can go sailing or kayaking on the Dingle Peninsula. It boasts some of the most stunning landscapes in the world that will leave you breathless.

Finally, it wouldn’t be an Irish holiday without visiting the Cliffs of Moher. Located in the western part of the country, there are many activities you can do. You can hike, walk, and check out the different natural habitats.

Things to Eat and Drink in Ireland

Ireland may not be as world-renowned in their cuisine as Italy or Mexico. If you are looking for traditional Irish meals, though, you can’t miss some of these delicious foods. Start your day with a traditional Irish breakfast. It consists of fried eggs, toast, Irish bacon, Irish sausage, baked beans, mushrooms, black pudding, and warmed tomato slices. For a little break between activities, you can head to a pub for some Irish pub food. Pick from a variety of meals like fish and chips, shepherd’s pie, or Irish stew. For afternoon tea, enjoy a nice Irish scone to go along with your traditional black Irish tea.

By nightfall, go to the local pub down the street and get a nice pint of Guinness beer, considered by many to be a huge part of Irish culture. If you don’t fancy a Guinness, you can always opt for a Jameson whiskey.

Fun Facts About Ireland

Hook Lighthouse sunset, Ireland

Located in the Hook Peninsula, Hook Lighthouse opened in 1172, making it the oldest lighthouse in Ireland and the second oldest in Europe after the Tower of


in Spain.

©Michal Wlodarczyk/

  • St. Patrick is the patron saint of Ireland.
  • Ireland is the only nation in the world that has a musical instrument as its symbol — the harp.
  • Halloween originated in Ireland about 2,000 years ago as a pagan festival called Samhain.
  • The world’s oldest working lighthouse, Hook Lighthouse, is in Ireland.
  • Ireland is one of the few countries in the world without snakes.
  • There are over 30,000 castles in Ireland.
  • Ireland holds the record for winning the Eurovision Song Contest seven times.


Ireland in September is a pleasant time. The weather is not too hot and it is not too cold, it’s just right. The average rainfall for the month is at a moderate rate, raining less than in the winter months. There is always a good chance of sunshine throughout the month and you can even find yourself looking at a few rainbows during your stay in the Emerald Isle.

There are also plenty of activities — both indoor and outdoor — to make your stay in Ireland fun-filled. From going to the Guinness Brewery to St. Patrick’s Cathedral, from the Cliffs of Moher to Blarney Castle, there are interests for everyone. Your time in the Emerald Isle is sure to be a lucky one, a trip you will always remember!

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About the Author

Patrick Macfarland is a writer at A-Z Animals primarily covering travel, geography, and history. Patrick has been writing for more than 10 years. In the past, he has been a teacher and a political candidate. He holds a Bachelor's Degree in Political Science from SDSU and a Master's Degree in European Union Studies from CIFE. From San Diego, California, Patrick loves to travel and try new recipes to cook.

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