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.

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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)

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Northern Ireland sunrise & sunset times for September 2021

Browse the sunrise and sunset times for Northern Ireland in September 2021. Select a month to view Northern Ireland sunrise & sunset times for the next 12 months. The Northern Ireland sunrise and 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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