Northern Ireland weather in September 2021

Get the latest coronavirus (COVID-19) updates for the UK with current travel advice, statistics and online resources.

Below are average maximum temperatures at popular destinations in Northern Ireland in September. Select a destination to see more weather parameters.

More destinations >>

Recommended for Northern Ireland

  • Top deals & discounts
  • Northern Ireland weather overview
  • Northern Ireland climate averages by month
  • More destinations
  • Best time to go to Northern Ireland
  • Northern Ireland 5-day weather forecast

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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.

  • Save EXTRA 15% on gift experiences, activities & breaks
  • Plus personalised gifts, hampers & gift boxes
  • Buy gifts for any occasion including birthdays & Christmas
Show discount codeShow discount code ******R2T

Expires at 23:59 on Friday 31st Dec 2021 · View all Buyagift offers

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)

Back to top

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.

JanFebMarAprMayJunJulAugSepOctNovDec

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
  • Save EXTRA 10% on ALL Q-Park car parks in the UK
  • Choose from 70 Q-Park car parks in 25 towns & cities
  • Discount cannot be combined with cashback
Show discount codeShow discount code ******0CT

Expires at 23:59 on Thursday 9th Sep 2021 · View all Q-Park offers

More Northern Ireland destinations

More destinations & map >>

Related posts

Popular travel offers

Top ^

*affiliate links: find out how we are funded and why this helps us remain free to use.