Month guide · Dublin · Ireland
Dublin in September
What September is really like in Dublin: weather, crowds, prices, events and what to pack.
Updated By the AMZBooking editorial team
Photo: Pilgab, CC BY-SA 3.0
Quick answer
September is one of the best months to visit Dublin. Expect average highs of 17°C (63°F), lows of 10°C (50°F), about 10 rainy days and roughly 12.6 hours of daylight. Often settled and mild, with festivals filling the calendar once the summer peak has passed.
Key facts
- Average high / low
- 17°C (63°F) / 10°C (50°F)
- Rainy days
- About 10
- Daylight
- About 12.6 hours
- Sea temperature
- 15°C (59°F)
- Crowds
- Busy
- Hotel prices
- High
Weather in September
September is the 4th-warmest month in Dublin: days average 17°C (63°F) against a yearly average high of 13°C (55°F), and nights fall to about 10°C (50°F). Rain falls on roughly 10 of its 30 days. Compared with August (19°C (66°F)), September is cooler; by October highs drop to around 14°C (57°F).
- Sunrise (15 September)
- About 06:58
- Sunset (15 September)
- About 19:42
- Daylight
- About 12.6 hours
- Sea
- 15°C (59°F)
Autumn (September–November). Theatre and Fringe festivals, the Dublin Marathon and Halloween; increasingly wet and windy by November.
Crowds and prices
On a 1–5 scale, September rates 4 for crowds (the peak is July at 5) and 4 for hotel prices (highest in July). Book accommodation early: September is one of the pricier months.
Events in September
- Dublin Fringe Festival (usually September)
- Culture Night — free late openings (usually September)
- Dublin Theatre Festival (usually late September–October)
Dates move from year to year. Check the organiser’s site before booking travel around an event.
What to do in September
With frequent rain, plan around indoor sights and keep outdoor time flexible.
Museum · Trinity College
Trinity College and the Book of Kells
The cobbled campus itself is free to walk through; come early or late in the day, when Front Square is quiet.
- Time needed
- 1–1.5 hours
- Cost
- Mid-priced
- Iconic
- History
- Art
- Rainy day
Museum · The Liberties
Guinness Storehouse
A seven-storey former fermentation building at the St James's Gate brewery, shaped inside like a giant pint glass, tells the story of Guinness from Arthur Guinness's 9,000-year lease of 1759 to its famous advertising.
- Time needed
- 2–2.5 hours
- Cost
- Mid-priced
- Iconic
- Views
- Rainy day
- Food
Historic site · Kilmainham
Kilmainham Gaol
Combine it with the Irish Museum of Modern Art in the Royal Hospital Kilmainham, about a 10-minute walk away.
- Time needed
- 1.5 hours
- Cost
- Low cost
- History
- Iconic
- Rainy day
Museum · Kildare Street
National Museum of Ireland – Archaeology
Ireland's archaeology museum on Kildare Street displays Bronze Age gold, the Ardagh Chalice and the Tara Brooch, Viking finds from Dublin and the 'Kingship and Sacrifice' gallery of Iron Age bog bodies preserved in peat.
- Time needed
- 1.5–2 hours
- Cost
- Free
- Free
- History
- Rainy day
- Kids
What to pack
For highs near 17°C, lows near 10°C and 10 wet days: layers, a warm sweater and a jacket for cool evenings; a packable rain jacket for showers; comfortable walking shoes.
Is September a good time to visit Dublin?
One of the best months to visit Dublin, with 3 notable events on the calendar. The other best months are May–August. Compare every month.
Dublin in other months
Questions travellers ask
+Is September a good time to visit Dublin?
It is one of the best months to visit Dublin. Often settled and mild, with festivals filling the calendar once the summer peak has passed.
+How warm is Dublin in September?
Average highs are around 17°C (63°F) and lows around 10°C (50°F).
+Does it rain a lot in Dublin in September?
Expect rain on about 10 days of the month.