Ireland in september: average Weather, Temperature and Climate, Where to go?
Weather in Ireland in september 2025
In this section, you have access to the weather forecast for september for most popular cities in Ireland. These datas are probabilities for september from weather reports for over 10 years. The percentage indicates the possibility of having the weather indicated.
Average weather in september in Dublin
good weather
Weather at 6am
54°F
Partly Cloudy
28% of time
26%
26%
9%
Weather at 12pm
61°F
Cloudy
36% of time
34%
20%
8%
Weather at 6pm
59°F
Partly Cloudy
34% of time
27%
26%
12%
Weather at 3am
54°F
30%
28%
15%
14%
Where to go in Ireland in september?
Where to go in Ireland in september: destination map
Where to go in each region in september?
| Connacht (Galway, Connemara National Park, Belmullet...) | 59°F to 63°F | 2 à 11 days | 59°F | tolerable weather |
| Leinster (Dublin, Kilkenny, Dundalk...) | 61°F to 63°F | 3 à 5 days | 59°F to 61°F | good weather* |
| Munster (Cork, Dingle, Limerick...) | 61°F to 63°F | 3 à 9 days | 59°F to 61°F | tolerable weather* |
| North East Ireland (Ulster) (Letterkenny, Killybegs, Dungloe...) | 59°F to 61°F | 3 à 9 days | 58°F to 59°F | tolerable weather* |
Where should you go in Ireland in september when it comes to the weather?
Remember:
The climate in Ireland in september ranges from good to tolerable depending on the region and city.
The climate throughout September in Ireland depends on the location of each locality. Thus, one will have favorable climatic conditions in the south, rainy days in the center and conditions barely favorable for the rest of the territory.
September in Malin Head and Northern Ireland
One will have the opportunity to enjoy several days of sunshine. Even if sometimes the sky is covered with clouds and the showers may occur at any moment.
September in Birr and Central Ireland
Not only is the weather refreshing, but the presence of rain also accentuates the poor quality of the weather in Ireland throughout September on the center of the island.
September in Dublin and the East Coast of Ireland
The climatic conditions of Dublin have improved because despite a discrete decrease in heat, the sunny days count many. One will spend pleasant moments here.
Septmber in Valentia and the South-west Coast of Ireland
Thanks to the mildness of the atmosphere and the regression of the showers, the climatic conditions in Valentia and its surroundings will allow to enjoy a comfortable climate.
Climate in Ireland in september
Climate in Dublin in september
In the month of september, the mean temperature in Dublin is 58°F (maximum temperature is 61°F and minimum temperature is 54°F). The climate is quite fresh in this city in the month of september, but it is tolerable when dressing warm. With 2.7in over 4 days, rainfall can happen for your stay. But this is reasonably and it will not be continuous.
With a correct weather, the month of september is okay (but not good month) for traveling in this city in Ireland.
| September | |||
| Average temperature | 58°F | ||
| Highest temperature | 61°F | ||
| Lowest temperature | 54°F | ||
| Sea temperature | 59°F | ||
| Rainfall | 2.7in | ||
| Number of days with rainfall | 4 day(s) (13%) | ||
| Humidity | 91% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 50% | ||
| Length of day | 12:41 | ||
| Our opinion at whereandwhen.net | good |
Climate in Cork in september
In the month of september, maximum temperature is 63°F and minimum temperature is 54°F (for an average temperature of 58°F). The climate is rather cool here in the month of september, but it is bearable when dressing hot. With 3.9in over 5 days, rainfall can happen during your holidays. But this is rather moderate and it is only of temporary showers.
With a correct weather, the month of september is okay (but not the best time) for traveling there in Ireland.
| September | |||
| Average temperature | 58°F | ||
| Highest temperature | 63°F | ||
| Lowest temperature | 54°F | ||
| Sea temperature | 61°F | ||
| Rainfall | 3.9in | ||
| Number of days with rainfall | 5 day(s) (17%) | ||
| Humidity | 93% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 52% | ||
| Length of day | 12:39 | ||
| Our opinion at whereandwhen.net | good |
Climate in Galway in september
In september, the mean temperature in Galway is 58°F (maximum temperature is 63°F and minimum temperature is 52°F). The climate is rather cold in that area in the month of september, but it is endurable by dressing warm. With 4.2in over 6 days, rainfall can happen for your vacations. But this is pretty reasonably and it will not be continuous.
With a correct climate, september is okay (but not good month) for traveling in Galway in Ireland.
| September | |||
| Average temperature | 58°F | ||
| Highest temperature | 63°F | ||
| Lowest temperature | 52°F | ||
| Sea temperature | 59°F | ||
| Rainfall | 4.2in | ||
| Number of days with rainfall | 6 day(s) (20%) | ||
| Humidity | 93% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 61% | ||
| Length of day | 12:41 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Belmullet in september
In the month of september, the mean temperature in Belmullet is 59°F (maximum temperature is 59°F and minimum temperature is 58°F). The climate is fairly cool there in this month, but it is livable when dressing warm. With 6.6in over 11 days, you will experience some showers throughout your journey. But this is rather reasonably and you will not be too bothered by it.
With a correct climate, september is okay (but not good time) for traveling in Belmullet.
| September | |||
| Average temperature | 59°F | ||
| Highest temperature | 59°F | ||
| Lowest temperature | 58°F | ||
| Sea temperature | 59°F | ||
| Rainfall | 6.6in | ||
| Number of days with rainfall | 11 day(s) (36%) | ||
| Humidity | 86% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 61% | ||
| Length of day | 12:43 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Connemara National Park in september
In the month of september, maximum temperature is 59°F and minimum temperature is 52°F (for an average temperature of 56°F). The climate is fairly cold here in this month, but it is endurable by dressing cosy. With 3.7in over 6 days, rain may occur throughout your vacations. But this is rather moderate and you will not be too bothered by it.
With a correct weather, the month of september is okay (but not good month) for traveling in Connemara National Park.
| September | |||
| Average temperature | 56°F | ||
| Highest temperature | 59°F | ||
| Lowest temperature | 52°F | ||
| Sea temperature | 59°F | ||
| Rainfall | 3.7in | ||
| Number of days with rainfall | 6 day(s) (20%) | ||
| Humidity | 91% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 62% | ||
| Length of day | 12:42 | ||
| Our opinion at whereandwhen.net | tolerable |
All cities in Ireland in september
| Dublin in september | good weather |
| Cork in september | good weather |
| Galway in september | tolerable weather |
| Belmullet in september | tolerable weather |
| Connemara National Park in september | tolerable weather |
| Dingle in september | tolerable weather |
| Dundalk in september | tolerable weather |
| Dungloe in september | tolerable weather |
| Kilkenny in september | tolerable weather |
| Killybegs in september | tolerable weather |
| Letterkenny in september | bad weather |
| Limerick in september | tolerable weather |
| Achill Island in september | tolerable weather |
| Aran Islands in september | tolerable weather |
| Ardmore in september | good weather |
| Ballycastle in september | tolerable weather |
| Birr in september | tolerable weather |
| Bundoran in september | tolerable weather |
| Burren National Park in september | tolerable weather |
| Cashel in september | tolerable weather |
| Castletownbere in september | tolerable weather |
| Dalkey Island in september | good weather |
| Derrybeg in september | tolerable weather |
| Donegal in september | tolerable weather |
Weather data for Ireland in september:
Weather data for Ireland in september is derived from an average of the weather forecast since 2009 in Ireland. There is a margin of error and these forecasts are to be considered as general information only. The weather in Ireland can vary slightly from year to year, but these predictions should limit surprises. So you can pack your bags and check when is the best time to go to Ireland.