The month in detail
What to expect in September
Autumn marks the end of peak season in Dublin. Temperatures drop (17°C) and rain returns (32% of days). Expect rain on 32% of days — a light raincoat in the bag is recommended.
September ranks 4 out of 12 months in Dublin. Compared to August: −2°C daytime, −0.7h of sun per day.
This month's conditions
What it's like in September
UV index
2 · low
no protection needed
Feels like
comfortable
11°
Sea
17°C
cold, for the brave
Daylight
12.4h of daylight
Air quality
good
AQI 25
Compare
Is September the right month?
The best month in Dublin is July (7.2/10), 2.8 pts higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Dublin
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Dublin
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach holiday.
Country · Ireland
🗣️LanguageEnglish
💶CurrencyEuro (€)
🚗DrivingLeft-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘExpensive · 4/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘ+1.01°C/decade
🔥Hottest monthJuly · 19°C
❄️Coolest monthJanuary · 8°C
🌧️Rainiest month ⓘJanuary · 39%
🏖️ Beach holiday
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Similar climate
CotswoldsUnited Kingdom
GhentBelgiumBrugesBelgiumEdinburghScotland
AmsterdamNetherlands
Location
Where is Dublin ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
IrelandTemperate oceanic climate with a 7.2 → 0.9 gap between best and worst month. 10 years of ERA5 data to choose by project.
53.35°N · 6.26°W
Questions
Frequently asked questions
What is the best time to visit Dublin?
June is the best month with 18.0°C highs, 12.0°C lows, 6.0h of sunshine and 29.0% rainy days. The months of June & July offer comparable conditions.
How many hours of sunshine does Dublin get in June?
Dublin averages 6.0 sunshine hours per day in June. It is the sunniest month with a climate score of 7.0/10.
What is the rainiest month in Dublin?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Dublin in June?
In June, overnight lows reach 12.0°C, while afternoon highs average 18.0°C.
Is Dublin good in winter?
In winter (December-February), Dublin scores 1.0/10 on average — Difficult period — prefer the peak season.. The best month overall remains June with a score of 7.0/10.
When should you avoid Dublin?
January is the most difficult month to visit Dublin, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Dublin in September?
In September, the sea averages 17°C in Dublin: cold, for the brave. Best left to hardened swimmers or those with a wetsuit.
Do you need sun protection in Dublin in September?
The average UV index reaches 2 in September in Dublin (low), with about 12.4h of daylight. No protection needed.