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.

16
Belfast
15
Londonderry

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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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Northern Ireland holiday rentals

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Northern Ireland cottages

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Northern Ireland hotels

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Northern Ireland camping & hostels

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Northern Ireland holiday parks

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Northern Ireland car hire

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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.

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.

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