Early autumn · Weather & things to do
Dublin in September
Dublin edges cooler than August, with highs of 61°F (16°C), lows of 52°F (11°C) and about 3.0 in (76 mm) of rain.
At 76/100 for comfort (4th of 12), it's one of the best months to visit.
- Avg high
- 61°F (16°C)
- Avg low
- 52°F (11°C)
- Rain
- 3.0 in (76 mm)
- Humidity
- 87%
- Cloud cover
- 74%
- Daylight
- ~12 h 24 min
- Comfort score
- 76/100 · Great
What September feels like
Highs near 61°F (16°C) make for comfortable sightseeing weather.
After dark, temperatures fall to about 52°F (11°C).
Some rain is likely, about 3.0 in (76 mm) in the month, so pack for a shower or two.
Plan around September
September is one of Dublin's best months on the climate data.
- Last of the best-scoring months: by October, the score drops to 64/100.
- Comfort holds steady from August (78 → 76/100).
- September sits inside the May – Sep window our Dublin to the Wild Atlantic Way route recommends.
What to pack for September
- A warm layer for eveningslows near 52°F
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Dublin in September
September is good outdoor weather here, so these picks lean toward the open air.
Howth Cliff Walk
Loop around Howth Head with sea views and a lighthouse, 30 minutes by DART.
Why now September scores 76/100 for comfort, good conditions for being outside.
Glendalough
Monastic site and twin lakes in the Wicklow Mountains, about an hour south.
Why now Highs near 61°F and 3.0 in of monthly rain make this an easy outdoor pick.
Book of Kells at Trinity College
9th-century illuminated gospels, followed by the oak-vaulted Long Room library.
Guinness Storehouse
Seven floors on brewing history at St James's Gate, ending at the Gravity Bar view.
Chapter One
Michelin-starred Irish cooking beneath the Dublin Writers Museum.
Nearby in September
- Galway in September~116 mi · highs 63°F, 3.4 in rain · similar daytime temperatures, about as wet
- Doolin & the Cliffs of Moher in September~131 mi · highs 61°F, 4.1 in rain · similar daytime temperatures, wetter
- Connemara in September~155 mi · highs 60°F, 4.4 in rain · similar daytime temperatures, wetter
- The Cotswolds in September~213 mi · highs 65°F, 2.0 in rain · 2°C (3°F) warmer by day, drier
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Dublin in September: quick answers
Is September a good time to visit Dublin?
Yes. On the climate data it's one of the best months, scoring 76/100. Expect highs of 61°F (16°C) and 3.0 in (76 mm) of rain. September is inside the May – Sep window our Dublin to the Wild Atlantic Way route recommends.
How cold is Dublin in September?
Average highs are 61°F (16°C) and average lows 52°F (11°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Dublin in September?
Some: about 3.0 in (76 mm) of rain falls across September on average, the 5th-driest month of the year. The annual total is about 38.7 in (982 mm).
What should I pack for Dublin in September?
Bring a warm layer for evenings (lows near 52°F), packable rain jacket or umbrella (a shower or two is likely) and comfortable walking shoes (most places below are best reached on foot or with short walks).
Routes in season in September
- Dublin to the Wild Atlantic Way May – Sep
Planning Dublin in September?
Share this September plan with your group, poll everyone on dates and keep the packing list in one place.