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Northern Ireland weather in September 2021
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Below are average maximum temperatures at popular destinations in Northern Ireland in September. Select a destination to see more weather parameters.
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The September weather guide for Northern Ireland shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
How warm is it in Northern Ireland in September?
Daytime temperatures usually reach 16°C in Belfast, Northern Ireland in September, falling to 9°C at night.
How sunny is it in Northern Ireland in September?
There are normally 4 hours of bright sunshine each day in Belfast, Northern Ireland in September - that's 30% of daylight hours.
How warm is the sea around Northern Ireland in September?
The average sea temperature around Belfast, Northern Ireland in September is 14°C.
Does it rain in Northern Ireland in September?
There are usually 17 days with some rain in Belfast, Northern Ireland in September and the average monthly rainfall is 94mm.
Metric (°C / mm) | Imperial (°F / inches)
Northern Ireland sunrise & sunset times for September 2021
Browse the sunrise & sunset times for Northern Ireland in September 2021. Select a month to view Northern Ireland sunrise & sunset times for the next twelve months. The Northern Ireland sunrise & sunset times shown below are for Belfast.
|Date||Sunrise times||Sunset times|
|Wednesday, 1st September 2021||06:31||20:15|
|Wednesday, 15th September 2021||06:57||19:40|
|Thursday, 30th September 2021||07:24||19:02|
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