Derry (Londonderry) in september: average Weather, Temperature and Climate
Weather in Derry (Londonderry) in september 2025
The weather in Derry (Londonderry) in september comes from statistical datas on the last years. You can view the weather statistics for all the month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
tolerable weather
Weather at 6am
50°F
Fog
36% of time
33%
14%
10%
Weather at 12pm
59°F
Cloudy
52% of time
24%
10%
10%
Weather at 6pm
56°F
Cloudy
37% of time
29%
16%
10%
Weather at 3am
50°F
30%
20%
18%
15%
Evolution of daily average temperature and precipitation in Derry (Londonderry) in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Derry (Londonderry) in september.
The climate of Derry (Londonderry) in september is tolerable
the weather in Derry (Londonderry) in september is wet (with 1.7in of rainfall over 1 days). The weather is better from the previous month since in august it receives an average of 2.6in of rainfall over 3 days.
The climate is fairly cool in that area september, but it is livable by dressing hot. The thermometer averaged maximum of 61°F. On average, the recorded minimum temperature is 50°F. Thus, the mean temperature average on this month of september in Derry (Londonderry) is 56°F. Note that these seasonal averages are in contrast with those observed in Derry (Londonderry) in september with a maximum record of 77°F in 2021 and a minimum record of 32°F in 2010. You can plan to have about 7 days with temperatures over 65°F, or 23% of time.
On this month of september, day length in Derry (Londonderry) is generally 12:44. The sun rises at 06:02 and sunset is at 18:46.
With a correct climate, the month of september is okay (but not good) to go in that area.
September: another location in Northern Ireland?
If you want to go to Northern Ireland in september, there are destinations with better weather than Derry (Londonderry):
In september, Donwpatrick, Larne, Annalong, Bangor, Carrickfergus and Dundrum have good weather.
Seasonal average climate and temperature of Derry (Londonderry) in september
Check below seasonal norms These statistics are compiled from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 56°F | ||||
| Highest temperature | 61°F | ||||
| Lowest temperature | 50°F | ||||
| Highest record temperature | 77°F (2021) | ||||
| Lowest record temperature | 32°F (2010) | ||||
| Number of days at +65°F | 7 day(s) (23%) | ||||
| Sea temperature | |||||
| Average sea temperature | 58°F | ||||
| Lowest sea temperature | 57°F | ||||
| Highest sea temperature | 60°F | ||||
| Wind | |||||
| Wind speed | 20km/h | ||||
| Wind temperature | 47°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 1.7in | ||||
| Number of days with rainfall | 1 day(s) (5%) | ||||
| Record daily rainfall | 0.5in (2011) | ||||
| Other climate data | |||||
| Humidity | 95% | ||||
| Visibility | 8.04km | ||||
| Cloud cover | 65% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 10 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:02 | ||||
| Time of sunset | 18:46 | ||||
| Length of day | 12:44 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | tolerable | ||||
How was the weather last september?
Here is the day by day recorded weather in Derry (Londonderry) in september 2024:
54°F to 65°F
56°F to 59°F
52°F to 58°F
50°F to 58°F
47°F to 61°F
52°F to 70°F
54°F to 74°F
54°F to 61°F
47°F to 59°F
47°F to 56°F
45°F to 52°F
47°F to 52°F
38°F to 49°F
54°F to 61°F
52°F to 61°F
47°F to 61°F
52°F to 70°F
49°F to 67°F
47°F to 68°F
49°F to 67°F
50°F to 65°F
49°F to 63°F
50°F to 59°F
47°F to 52°F
45°F to 50°F
45°F to 47°F
45°F to 49°F
45°F to 54°F
45°F to 56°F
49°F to 50°F
Map: other cities in Northern Ireland in september
Cities near Derry (Londonderry):
| Strabane in september | bad weather |
| Limavady in september | tolerable weather |
| Castlerock in september | tolerable weather |
| Portstewart in september | tolerable weather |
| Coleraine in september | tolerable weather |
| Omagh in september | bad weather |
| Maghera in september | tolerable weather |
| Portrush in september | tolerable weather |
| Ballymoney in september | tolerable weather |
| Magherafelt in september | tolerable weather |
| Cookstown in september | tolerable weather |
| Dromore in september | bad weather |
Click over cities on the map for information about the weather in september.
Derry (Londonderry)
perfect weather
good
tolerable
bad
very bad
Weather data for Derry (Londonderry) in september:
Weather data for Derry (Londonderry) for september are derived from an average of the weather forecast since 2009 in Derry (Londonderry). There is a margin of error and these forecasts are to be considered as general information only. The weather in Derry (Londonderry) 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 Derry (Londonderry).