September

Weather in Ireland in September: A Traveler’s Guide ☔️🍂

September marks the transition from summer to autumn in Ireland, offering a mix of mild temperatures, occasional rain, and fewer crowds—making it an ideal time to explore the Emerald Isle. Whether you’re planning a city break in Dublin, a coastal drive along the Wild Atlantic Way, or a hike in the Wicklow Mountains, understanding Ireland’s September weather is key to packing smart and enjoying your trip.

🌡️ Temperature and Climate Overview

Ireland’s temperate maritime climate means September weather is generally mild but unpredictable. Here’s what to expect:

  • Average temperatures: 11–16°C (52–61°F).
    • Days are pleasantly cool, while nights can be chilly.
    • Coastal areas (e.g., Cork, Galway) may feel slightly warmer due to the Gulf Stream.
  • Rainfall: Expect 8–10 rainy days (average 70–90mm).
    • Showers are frequent but often short-lived—pack a waterproof jacket!
  • Sunshine: Around 4–5 hours of daily sunlight, with longer daylight early in the month.

Pro Tip: Layer your clothing—light sweaters, a raincoat, and sturdy walking shoes are essentials.

🍁 Seasonal Highlights

  • Autumn foliage begins to appear, especially in national parks like Killarney.
  • Harvest festivals (e.g., Galway Oyster Festival) celebrate local food and culture.
  • Fewer tourists compared to July/August mean quieter attractions and better hotel deals.

📅 Month Breakdown: Early vs. Late September

Period Weather Characteristics Travel Tips
Early Sep Summer-like warmth (up to 18°C) Great for outdoor activities.
Late Sep Cooler, more rain Ideal for cozy pub visits and museums.

🎒 Packing Essentials

  • ✅ Waterproof jacket or umbrella
  • ✅ Warm layers (fleece, scarf)
  • ✅ Comfortable waterproof shoes
  • ✅ Power adapter (Ireland uses Type G plugs)

🌦️ Regional Variations

  • West Coast (e.g., Galway, Cliffs of Moher): Windier with higher rainfall.
  • East Coast (e.g., Dublin): Drier and slightly warmer.
  • Inland (e.g., Kilkenny): Cooler nights, occasional fog.

For more details, see our guide to Ireland’s climate year-round or the best time to visit.

🚗 Travel Tips for September

  1. Book accommodations early—popular spots fill up for festivals.
  2. Check ferry schedules if visiting islands (e.g., Aran Islands), as services reduce post-summer.
  3. Sunrise/sunset: Days shorten from ~13.5 hours (early Sep) to ~11.5 hours (late Sep).

❓ FAQs

Q: Is September a good time for hiking?
A: Yes! Trails like the Wicklow Way are less muddy than in winter. Just check forecasts—sudden rain is common.

Q: Are attractions still open?
A: Most remain open, but some seasonal sites (e.g., Skellig Michael boat tours) close by late September.

Q: How crowded is it?
A: Mid-range—schools reopen in September, reducing family travel.

For deeper dives into adjacent months, explore August or October weather.

Final Note: September in Ireland blends the last warmth of summer with autumn’s crisp charm. With flexible plans and the right gear, you’ll savor its landscapes and culture rain or shine! 🌈

Basic Information about September

Feature Details
Average Temperature 11°C to 17°C
Rainfall 50-80 mm
Sunshine Hours 4-6 hours per day
Average Sea Temperature 14°C to 16°C
Day Length 12-13 hours of daylight
Weather Conditions Mix of mild, rainy, and sometimes windy days
Average Humidity 80%
Tourist Season Beginning to decline after peak summer
Average Wind Speed 15-20 km/h
Major Events Early autumn festivals and cultural events

September Weather FAQ for Ireland

Question Answer
What is the typical temperature range in Ireland during September? Average daytime temperatures range from 12°C to 17°C, with cooler evenings.
Does September mark the beginning of autumn in Ireland? Yes, September is considered the start of autumn, with changing leaf colors and cooler weather.
What is the average rainfall in September? Rainfall averages around 60-80mm, with occasional showers and some dry days.
Are there any notable weather events in September? September can experience Atlantic storms, leading to heavy rain and windy conditions.
What are the daylight hours like in September? Daylight decreases from about 12 hours at the start to around 11 hours by month’s end.
Is September a good time for outdoor activities in Ireland? Yes, with mild temperatures and fewer tourists, it’s suitable for outdoor pursuits.
What should travelers pack for September in Ireland? Layers, waterproof clothing, and warm accessories are recommended due to variable weather.
Are there any festivals or events in Ireland during September? September hosts various cultural festivals, agricultural fairs, and music events.
How does the weather in September compare to summer months? September tends to be cooler and wetter than July and August, with more variable conditions.

  • Ireland Weather – Detailed historical climate data for Ireland, including September conditions.
  • European Weather Averages – Monthly weather averages across Ireland with specific data for September.