01Weather
Dublin weather in September
Afternoons in September average 18.2 °C (65 °F) and nights cool to 10.1 °C (50 °F). The month brings about 77 mm (3.0 in) of rain spread over roughly 13 days. Compared with August it is 2.3 °C cooler; October is 3.4 °C cooler again.
What the averages hide
| In a typical September | Value | What it means |
|---|---|---|
| Warm afternoons (90th percentile) | 22 °C / 71 °F | one day in ten is at least this warm |
| Cool afternoons (10th percentile) | 15 °C / 59 °F | one day in ten stays below this |
| Cold nights (10th percentile) | 6 °C / 42 °F | one night in ten is colder than this |
| Days above 30 °C (86 °F) | 0.0 | per month, average 2016–2025 |
| Nights at or below 0 °C (32 °F) | 0.0 | frost mornings per month |
| Chance of rain on any given day | 42 % | at least 1 mm |
| Hottest / coldest September day 2016–2025 | 26.8 °C / 1.2 °C | extremes in the ten-year record |
02Daylight
Sunrise, sunset and the length of the day
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 1 September | 06:34 | 20:15 | 13.7 h |
| 15 September | 06:59 | 19:41 | 12.7 h |
| 30 September | 07:25 | 19:04 | 11.7 h |
Daylight shrinks by about 120 minutes over the month. Times are local (Europe/Dublin).
03Crowds
How busy Dublin is in September
busy The main sights are busy in September. What drives it:
- Dublin Fringe
- All-Ireland finals at Croke Park
- Culture Night
04Public holidays
Public holidays in September 2027
No public holidays in Ireland fall in September, so shops and museums keep normal hours all month.
05Events
What's on in Dublin in September
Every year in September
| Event | When | Type |
|---|---|---|
| Dublin Fringe Festival | September | culture |
| Culture Night | a Friday in September, free late openings | culture |
| All-Ireland Finals | July to September, Croke Park | sport |
07Packing
What to pack for Dublin in September
- layers: t-shirt plus a light jacket for evenings
- comfortable walking shoes
- a compact umbrella or hooded rain jacket, rain falls on roughly one day in three
08Editor's notes
What the numbers don't tell you
September is often the driest and most settled month, with afternoons around 17 °C, rain on about thirteen days, Fringe festival shows, Culture Night on a Friday in mid-September with free late openings across the city and the All-Ireland finals at Croke Park on the first and last weekends. Schools return and crowds ease. Evenings draw in noticeably but remain pleasant until mid-month.
Hotel rates fall after the first week, except on final weekends. The Dublin Theatre Festival opens at the end of September. The National Ploughing Championships draw the country to the midlands for three days. The Forty Foot and the Dublin Bay beaches are at their warmest, around 15 °C. For the Theatre Festival and the Bram Stoker Festival, see October.
09Compare
Dublin month by month
| Month | High | Low | Rain days | Sun h | Crowds | Verdict |
|---|---|---|---|---|---|---|
| January | 8 °C | 3 °C | 12 | – | quiet | Mixed |
| February | 10 °C | 3 °C | 13 | – | quiet | Mixed |
| March | 11 °C | 4 °C | 12 | – | very busy | Mixed |
| April | 13 °C | 5 °C | 11 | – | moderate | Good |
| May | 17 °C | 8 °C | 13 | – | busy | Good |
| June | 19 °C | 11 °C | 12 | – | busy | Good |
| July | 21 °C | 12 °C | 13 | – | very busy | Good |
| August | 20 °C | 12 °C | 14 | – | very busy | Good |
| September | 18 °C | 10 °C | 13 | – | busy | Good |
| October | 15 °C | 8 °C | 13 | – | moderate | Good |
| November | 11 °C | 5 °C | 14 | – | quiet | Good |
| December | 9 °C | 4 °C | 14 | – | moderate | Mixed |
Not sure about September? See the best time to visit Dublin.
10Elsewhere
September in nearby cities
| City | High | Rain days |
|---|---|---|
| London in September | 19 °C | 7 |
| Amsterdam in September | 20 °C | 10 |
| Paris in September | 22 °C | 10 |
| Copenhagen in September | 18 °C | – |
| Prague in September | 21 °C | 8 |
| Barcelona in September | 27 °C | 6 |
11FAQ
Dublin in September: your questions
Is September a good time to visit Dublin?
September is a good month to visit Dublin. Daytime highs average 18 °C (65 °F), rain falls on about 13 days, and hotel arrivals run above the yearly average, so the main sights are busy.
What is the weather like in Dublin in September?
Expect mild days around 18 °C (65 °F) and nights near 10 °C (50 °F). One September in ten brings afternoons above 22 °C, and one in ten stays below 15 °C.
Does it rain a lot in Dublin in September?
September brings about 77 mm (3.0 in) of rain over roughly 13 days, which is showery by Dublin standards. On any given day the chance of at least 1 mm of rain is 42 percent.
What should I wear in Dublin in September?
Pack layers: t-shirt plus a light jacket for evenings, comfortable walking shoes, a compact umbrella or hooded rain jacket, rain falls on roughly one day in three.
Is Dublin crowded in September?
The main sights are busy in September. Main drivers: Dublin Fringe; All-Ireland finals at Croke Park; Culture Night.
What time does it get dark in Dublin in September?
Around the middle of September the sun sets at about 19:41 and rises at 06:59, giving 12.7 hours of daylight.