Dún Laoghaire in september: average Weather, Temperature and Climate
Weather in Dún Laoghaire in september 2025
The weather in Dún Laoghaire in the month of september comes from statistical datas on the last years. You can view the weather statistics the entire month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather
Weather at 6am
54°F
Partly Cloudy
31% of time
28%
17%
13%
Weather at 12pm
61°F
Partly Cloudy
32% of time
23%
22%
17%
Weather at 6pm
59°F
Partly Cloudy
31% of time
27%
20%
18%
Weather at 3am
54°F
34%
28%
14%
13%
Evolution of daily average temperature and precipitation in Dún Laoghaire in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Dún Laoghaire in september.
The climate of Dún Laoghaire in september is good
the weather in Dún Laoghaire in september is quite dry (with 3.5in of precipitation over 5 days). The weather is better from the previous month since in august it receives an average of 4.2in of rainfall over 6 days.
The climate is quite cool here the month of september, but it is endurable by dressing hot. Temperatures are up to 61°F. In the morning the temperature drops to 54°F. Thus, the mean temperature average on this month of september in Dún Laoghaire is 58°F. Note that seasonal normals in contrast with those observed in Dún Laoghaire in september with a maximum record of 70°F in 2016 and a minimum record of 41°F in 2010. You can hope to have about 5 days with temperatures above 65°F, or 17% of time.
On this month of september, day length in Dún Laoghaire is generally 12:41. Sunrise is at 05:59 and sets at 18:40.
With a correct climate, the month of september is okay (but not good) to go in this city.
Seasonal average climate and temperature of Dún Laoghaire in september
Check below seasonal norms These datas are set from the weather statements of the past years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 58°F | ||||
| Highest temperature | 61°F | ||||
| Lowest temperature | 54°F | ||||
| Highest record temperature | 70°F (2016) | ||||
| Lowest record temperature | 41°F (2010) | ||||
| Number of days at +65°F | 5 day(s) (17%) | ||||
| Sea temperature | |||||
| Average sea temperature | 59°F | ||||
| Lowest sea temperature | 58°F | ||||
| Highest sea temperature | 60°F | ||||
| Wind | |||||
| Wind speed | 23km/h | ||||
| Wind temperature | 50°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.5in | ||||
| Number of days with rainfall | 5 day(s) (16%) | ||||
| Record daily rainfall | 2.1in (2010) | ||||
| Other climate data | |||||
| Humidity | 90% | ||||
| Visibility | 9.14km | ||||
| Cloud cover | 47% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:59 | ||||
| Time of sunset | 18:40 | ||||
| Length of day | 12:41 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Dún Laoghaire in september 2024:
58°F to 65°F
56°F to 61°F
50°F to 61°F
52°F to 58°F
54°F to 59°F
59°F to 63°F
59°F to 63°F
59°F to 65°F
49°F to 61°F
54°F to 58°F
50°F to 56°F
43°F to 54°F
43°F to 56°F
52°F to 63°F
59°F to 61°F
52°F to 63°F
54°F to 63°F
54°F to 61°F
54°F to 59°F
56°F to 61°F
56°F to 59°F
58°F to 59°F
56°F to 58°F
52°F to 59°F
47°F to 54°F
49°F to 56°F
47°F to 52°F
47°F to 56°F
52°F to 54°F
50°F to 54°F
Map: other cities in Ireland in september
Cities near Dún Laoghaire:
| Dalkey Island in september | good weather |
| Dublin in september | good weather |
| Bray in september | good weather |
| Malahide in september | good weather |
| Greystones in september | good weather |
| Wicklow Mountains National Park in september | tolerable weather |
| Skerries in september | good weather |
| Balbriggan in september | good weather |
| Wicklow in september | good weather |
| Naas in september | tolerable weather |
| Laytown in september | good weather |
| Droichead Nua in september | tolerable weather |
Click over cities on the map for information about the weather in september.
Dún Laoghaire
perfect weather
good
tolerable
bad
very bad
Weather data for Dún Laoghaire in september:
Weather data for Dún Laoghaire for september are derived from an average of the weather forecast since 2009 in Dún Laoghaire. There is a margin of error and these forecasts are to be considered as general information only. The weather in Dún Laoghaire can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Dún Laoghaire.