Belfast in september: average Weather, Temperature and Climate
Weather in Belfast in september 2025
The weather in Belfast in the month of september comes from statistical datas on the last years. You can view the weather statistics for the whole 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
52°F
Partly Cloudy
24% of time
23%
17%
15%
Weather at 12pm
61°F
Cloudy
28% of time
25%
23%
15%
Weather at 6pm
58°F
Moderate rain at times
34% of time
24%
19%
17%
Weather at 3am
52°F
27%
20%
20%
16%
Evolution of daily average temperature and precipitation in Belfast in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Belfast in september.
The climate of Belfast in september is tolerable
The climate in september in Belfast is wet (with 3.9in of rainfall over 6 days). The weather is better from the previous month since in august it receives an average of 5.9in of precipitation over 10 days.
The climate is rather cold there september, but it is tolerable when dressing warm. The high seasonal norm is 61°F. On average, the recorded minimum temperature is 52°F. Thus, the mean temperature average on this month of september in Belfast is 58°F. Note that these seasonal averages are in contrast with those observed in Belfast in the month of september with a maximum record of 72°F in 2021 and a minimum record of 40°F in 2010. You can plan to have about 5 days with temperatures over 65°F, or 17% of the month.
On this month of september, day length in Belfast is generally 12:43. Sunrise is at 05:57 and sets at 18:40.
With proper weather, september is okay (but not the best) to go in this city in North Ireland.
September: another location in Northern Ireland?
If you want to go to Northern Ireland in september, there are destinations with better weather than Belfast:
In september, Donwpatrick, Larne, Annalong, Bangor, Carrickfergus and Dundrum have good weather.
Seasonal average climate and temperature of Belfast in september
Check below seasonal norms These datas are generated from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 58°F | ||||
| Highest temperature | 61°F | ||||
| Lowest temperature | 52°F | ||||
| Highest record temperature | 72°F (2021) | ||||
| Lowest record temperature | 40°F (2010) | ||||
| Number of days at +65°F | 5 day(s) (17%) | ||||
| Sea temperature | |||||
| Average sea temperature | 58°F | ||||
| Lowest sea temperature | 57°F | ||||
| Highest sea temperature | 59°F | ||||
| Wind | |||||
| Wind speed | 21km/h | ||||
| Wind temperature | 49°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.9in | ||||
| Number of days with rainfall | 6 day(s) (20%) | ||||
| Record daily rainfall | 1.9in (2010) | ||||
| Other climate data | |||||
| Humidity | 93% | ||||
| Visibility | 8.72km | ||||
| Cloud cover | 57% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 10 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:57 | ||||
| Time of sunset | 18:40 | ||||
| Length of day | 12:43 | ||||
| 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 Belfast in september 2024:
54°F to 61°F
56°F to 61°F
47°F to 61°F
47°F to 58°F
49°F to 63°F
56°F to 70°F
54°F to 67°F
56°F to 65°F
50°F to 59°F
50°F to 56°F
47°F to 54°F
45°F to 54°F
38°F to 54°F
50°F to 65°F
52°F to 63°F
47°F to 65°F
54°F to 67°F
52°F to 63°F
50°F to 65°F
49°F to 65°F
50°F to 65°F
52°F to 63°F
49°F to 61°F
52°F to 56°F
47°F to 54°F
49°F to 50°F
45°F to 52°F
40°F to 56°F
45°F to 56°F
49°F to 50°F
Map: other cities in Northern Ireland in september
Cities near Belfast:
| Castlereagh in september | tolerable weather |
| Newtownabbey in september | tolerable weather |
| Holywood in september | tolerable weather |
| Lisburn in september | tolerable weather |
| Carrickfergus in september | good weather |
| Newtownards in september | good weather |
| Ballyclare in september | tolerable weather |
| Bangor in september | good weather |
| Antrim in september | tolerable weather |
| Millisle in september | tolerable weather |
| Donaghadee in september | tolerable weather |
| Kircubbin in september | good weather |
Click over cities on the map for information about the weather in september.
Belfast
perfect weather
good
tolerable
bad
very bad
Weather data for Belfast in september:
Weather data for Belfast for september are derived from an average of the weather forecast since 2009 in Belfast. There is a margin of error and these forecasts are to be considered as general information only. The weather in Belfast 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 Belfast.