Weather in Dublin in September
As an Amazon Associate we earn from qualifying purchases. We also earn commission from other retail partners. Links below are affiliate links.
Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for September in Dublin.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youDublin in September is pleasantly mild — daytime temperatures average 17.5°C, dropping to 11.9°C at night. The month is fairly wet (12 rainy days on average), with roughly 8.5 hours of sunshine a day. Weather-wise, this is one of the most reliable months to travel. For the complete picture, see the best time to visit Dublin — every month compared. Once you know when to go, find your Dublin packing list at 247PackingList.
Get ready for Dublin in September
Search flights to Dublin
Compare 100+ airlines for September — one search, best price.
Search Flights →Travel clothing layers
Pack layers — temperatures can vary significantly between day and night.
Check Price →What to pack for Dublin in September
- Warm layers
- Light jacket or fleece
- Comfortable walking shoes
- Light waterproof layer
Compare all months in Dublin
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 8.5°C | 60.6mm | 10/10 |
| February | 9.6°C | 80.5mm | 10/10 |
| March | 10.5°C | 64.8mm | 10/10 |
| April | 11.6°C | 48.5mm | 10/10 |
| May | 15.0°C | 59.0mm | 10/10 |
| June | 17.8°C | 71.0mm | 10/10 |
| July | 19.2°C | 90.5mm | 10/10 |
| August | 18.9°C | 85.4mm | 10/10 |
| September | 17.5°C | 92.7mm | 10/10 |
| October | 14.6°C | 124.5mm | 9/10 |
| November | 11.3°C | 67.4mm | 10/10 |
| December | 8.8°C | 92.6mm | 10/10 |
Full month-by-month guide: best time to visit Dublin →
For facts about Ireland — currency, language and dialling code — see our Ireland country guide at 247CountryInfo. Travellers also find it useful to keep a Dublin travel guide to hand. Check clothing sizes in Ireland before you shop.
Frequently Asked Questions
Is September a good time to visit Dublin?
September rates 10/10 for visiting Dublin — excellent time to visit. Expect average highs of 17.5°C, 92.7mm of rain across the month and about 8.5 hours of daily sunshine.
What is the temperature in Dublin in September?
In September, Dublin has average highs of 17.5°C (63.5°F) and average lows of 11.9°C (53.4°F).
Does it rain in Dublin in September?
Some rain is likely. Dublin averages 92.7mm across about 12 rainy days in September, so a light waterproof layer is worth packing.
What should I wear in Dublin in September?
For Dublin in September (17.5°C highs / 11.9°C lows), pack warm layers plus light jacket or fleece, comfortable walking shoes, light waterproof layer.
More essentials for Dublin in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
Check Price →Last updated:
Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.