With a continuation of—and occasional improvement on—the weather of the summer high season, September overall could offer the perfect vacation in Ireland. Air and water temperatures are still some of the year’s best, and yet crowds are minimal now as kids are back in school and families have returned home from their summer vacation.
## Discovering the Emerald Isle in September: A Comprehensive Guide
September in Ireland marks a transition, a gentle shift from the vibrant hues of summer to the warmer, more muted tones of autumn. While the peak summer season wanes, the magic of Ireland certainly does not. In fact, September offers a unique opportunity to experience the country’s beauty with fewer crowds and potentially lower costs, all while enjoying weather that can still be remarkably pleasant. The air is crisp, the landscapes are lush, and the spirit of Ireland remains as vibrant as ever.
Air temperatures in September remain surprisingly mild, often hovering just below the peak temperatures experienced in July and August. Rainfall, while always a possibility in Ireland, is not significantly higher than in the summer months. This makes September an ideal time to explore the diverse landscapes, from the rugged coastlines to the rolling green hills, without the intensity of summer crowds.
### Exploring Killarney & Southwestern Ireland in September
Southwestern Ireland, with its stunning scenery and charming towns, holds onto the vestiges of summer longer than other regions. The weather in Killarney and its surrounding areas in September leans more towards summery than autumnal. Average daily highs reach a comfortable 63°F (17°C), only slightly cooler than the peak summer months. Rainfall remains manageable, allowing for plenty of outdoor exploration. Perhaps even more enticing, the ocean retains much of the warmth absorbed over the summer, averaging around 61°F (16°C), making it tempting for a refreshing dip.
This region offers a plethora of activities for the September traveler. With Ireland’s relatively dry and mild September weather, outdoor pursuits are particularly appealing. Knowing that the full force of winter is soon to arrive, now is the perfect time to explore before some places reduce opening times or close for the season. The far southwest is an excellent starting point for any Irish adventure.
In Co. Kerry, the legendary southwest peninsulas offer exceptional mountain and coastal hiking opportunities. Consider tackling sections of the renowned Kerry Way, traversing the Iveragh Peninsula, or exploring the equally captivating Dingle Way on the Dingle Peninsula. For those seeking less strenuous walks closer to the town of Killarney, Killarney National Park beckons. As Ireland’s oldest national park, it provides a stunning backdrop for leisurely strolls and more challenging hikes. Should the weather turn, the park also boasts indoor attractions such as the magnificent Muckross House & Gardens, a splendid stately home, and the historic ruin of Ross Castle.
Another must-see destination in this region is the Rock of Cashel. This iconic landmark, steeped in history and legend, served as a fortress and one-time seat of power for Irish royalty. Today, visitors can explore its medieval ruins and enjoy beautiful riverside and woodland walks surrounding the site.
The islands dotting the mainland coast offer yet another compelling reason to visit Southwestern Ireland in September. A boat trip to the rocky Skellig Islands near Dingle presents a unique opportunity to witness their stark beauty and historical significance. Even better, venture to the otherworldly and traditional Aran Islands near Galway, where you can experience a glimpse into traditional Irish life. However, be mindful that boat trips to these islands may become less frequent as October approaches, due to rougher seas and a decline in visitor numbers.
### Dublin & Eastern Ireland in September
Dublin and Eastern Ireland in September offer a delightful mix of city excitement and countryside serenity. With rainfall dropping to an average of just 2.36 inches (60 mm) for the month, this region experiences one of its driest periods of the year. Average monthly temperatures range from a comfortable 50°F-63°F (10°C-17°C), creating ideal conditions for walking and exploring. While sunshine hours decrease to an average of four per day, the weather remains conducive to enjoying the outdoors.
Take advantage of the last vestiges of fair weather and immerse yourself in the region’s stunning countryside. The Wicklow Way is widely considered to offer some of the most enchanting hiking experiences in all of Ireland. This scenic trail leads you through picturesque villages like Enniskerry, past cascading waterfalls like Powerscourt Waterfall on the enchanting Powerscourt Estate, and through wooded hills, and past the haunting monastic ruins of Glendalough Abbey.
The eastern coastline boasts a collection of breathtaking sandy beaches. Some, like Loughshinney, are conveniently located within Co. Dublin and are easily accessible from the city. Others, such as the pristine Rosslare Strand, are situated within sight of the ferry arrivals from Wales. If the weather takes a turn, dedicate some time to exploring the vibrant city of Dublin, which is particularly lively during the Dublin Fringe Festival in September.
### Belfast & Northern Ireland in September
Northern Ireland in September presents a slightly more unpredictable weather scenario. While the region enjoys an average of four daily hours of sunshine, rainfall approaches some of its highest levels of the year in Belfast. This means visitors might experience lovely summery weather one day and colder, bleaker conditions the next. However, seawater temperatures remain at their annual high, averaging around 57°F/14°C.
Despite the potential for unpredictable weather, September remains an excellent time to explore Northern Ireland’s phenomenal natural beauty. A must-see destination is the Causeway Coast, home to the Unesco-listed Giant’s Causeway. This extraordinary geological formation, comprised of thousands of interconnecting basalt columns, creates one of the most spectacular coastal attractions imaginable. At this time of year, a mix of sun and wind enhances the place’s wild, ethereal atmosphere.
For avid hikers, the Ulster Way offers an unparalleled experience. This epic 636-mile (1,024-km) loop traverses almost all of Northern Ireland, making it one of the UK’s longest and most scenic hiking routes. Consider tackling the Lough Bradan-Gortin or the Gortin-Moneyneany sections for some of the best panoramic views and stretches that wind through the Sperrin Mountains, Northern Ireland’s largest mountain range.
If you prefer a more sheltered walk closer to civilization, the Red Squirrel and Sculpture trail beginning at Glenarm Castle is particularly captivating in September. Be sure to visit Belfast, which hosts its annual international tattoo in September, a spectacular display of parades, live music, and dance.
### What to Do in September
If the weather cooperates, and it very well might since September often boasts excellent weather, prioritizing outdoor activities this month is highly recommended.
**Killarney & Southwestern Ireland:**
With water temperatures peaking and crowds diminishing, September is an ideal time to visit the beach. Swimming at some of the country’s finest sandy beaches lining the southwestern peninsulas is a delightful activity, especially while seawater temperatures remain relatively warm. Consider visiting Keem Bay on Achill Island, Co. Mayo, or Coumeenole Beach near Dunquin in Co. Kerry.
Hiking trails abound around the Iveragh Peninsula (on the Kerry Way) and the Dingle Peninsula (on the Dingle Way). Cycling is equally enjoyable, and you can experience much of the best of the west coastline along the Wild Atlantic Way.
For a unique perspective, take advantage of the warm waters and try sea kayaking. The Donegal region is widely regarded as one of the best places in the world for this activity. Alternatively, consider diving in Killary Harbour in Connemara, Co. Galway, a prime location, along with several sites in Co. Cork.
**Dublin & Eastern Ireland:**
Capitalize on any lingering fair weather and prioritize the region’s sensational hiking opportunities. The Wicklow Way showcases the very finest aspects of Eastern Ireland, commencing from Dublin’s southern suburbs. Alternatively, enjoy a leisurely stroll along some of the region’s stunning sandy beaches and take a swim if the mood strikes while the weather is sunny and the water temperatures remain warm.
This region is also known as ‘Ireland’s Ancient East.’ To gain insight into Ireland’s rich history, with both outdoor and indoor activities available, visit the Irish National Heritage Park near Wicklow, which guides you through 9,000 years of the country’s past in an enchanting open-air setting.
Quality diving is also offered at the Muglins by Dalkey Island near Dublin, a rock teeming with seabirds for much of the year. There are also numerous delightful wild swimming locations along the coastline, perfect for enjoying while seawater temperatures remain relatively high.
**Belfast & Northern Ireland:**
Hiking along the rugged Causeway Coast, including the magnificent basalt columns of the Unesco-listed Giant’s Causeway, is a popular activity in this region.
The 636-mile (1,024-km) Ulster Way offers a fantastic perspective on the region’s scenery, taking hikers to high mountains, wild forests, and serene lakes, as well as the breathtaking coastline.
Alternatively, spot locations from the blockbuster TV series “Game of Thrones,” which filmed extensively in this region.
Other sights to explore include the Downhill Strand in Co. Derry, Tollymore Forest Park, in Co. Down, and Co. Antrim’s famous Dark Hedges, an avenue of ancient beech trees now tinged with fall colors and one of Ireland’s most photographed natural attractions. The seas are warm and relatively calm, making it ideal for sea kayaking. Northern Ireland stands out with its stunning North Coast Sea Kayak Trail between Co. Londonderry and Co. Antrim, passing the Giant’s Causeway.
### September Events
* **Belfast International Tattoo:** A spectacular display of military and community-themed dance, parades, and music held in early September in Belfast.
* **Dublin Fringe Festival:** Held over two weeks at the beginning of September in Dublin, this event focuses on emerging talent in dance, theater, music, visual arts, and related fields. Performing artists also host workshops to share their skills with others.
* **International Oyster & Seafood Festival, Galway:** The west coast of Ireland boasts incredible seafood, showcased at this standout food festival over three days towards the end of the month.
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