Northern Ireland weather

Our guide to the weather in Northern Ireland destination during September

15

Average high

3

UV Index

65mm

Monthly rainfall

89%

Humidity

We've looked at the most up-to-date weather data for Northern Ireland, covering the last 12 years up to 2022, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Northern Ireland weather in September.

What's the temperature like in Northern Ireland during September?

The temperature reaches around 15℃ during the daytime in September, falling away to 7℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it rain in Northern Ireland during September?

On average, there will be 6 rainy days during the month, amounting to 65.1mm in total. That's broadly comparable with the amount of rain we see in England during the summer months, and would be considered dry. There's a small chance that you'll catch a thunderstorm during your trip.

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Northern Ireland Blog posts

From Ireland's most popular travel bloggers

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17th October 2022 by Eat Sleep Breathe Travel

Haunted pubs in Ireland where you can drink with a ghost

Being the birthplace of Halloween, it’s no wonder that Ireland takes one of the top spots for most haunted countries in the world. I’ve already shared some of the most haunted castles in Ireland, some of which you can even sleep in. However, you don’t have to head to a castle to find a ghost in Ireland. You can have a drink with them too. Here are some of the most haunted pubs in Ireland....

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23rd May 2022 by Where is Tara?

Derry Jazz Festival - A Guide

If you’re considering visiting Derry for one of the city’s many festivals then I’m here to convince you that Derry Jazz Festival is the one! My very first jazz festival was the Elbjazz Festival in Hamburg, Germany. I remember being completely amazed by the family-friendly festival atmosphere. Ever since then I’ve had a very serious grš for jazz festivals and the City of Derry Jazz Festival is my absolute favourite. Let me tell you why…...

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6th May 2022 by Where is Tara?

18 wonderful things to do in Derry

There’s no shortage of amazing things to do in Derry, especially now that it has shot to fame after the huge success of Derry Girls. Whether you’re a Michelle or a Clare (like me) there’s something to suit everyone in Derry. Not only is there plenty to do in Derry itself, but it’s also a brilliant base for exploring The Wild Atlantic Way and the Causeway Coast in the opposite direction. However, with all there is to see in Derry you’ll have barely have time to think about exploring...

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20th August 2020 by The Daily S'elf

Fermanagh staycation

To feel as far away as I did in Fermanagh, but only a couple of hours drive from Dublin is what staycation dreams are made of. If you’re planning a getaway, make sure to consider Northern Ireland this summer. Amazing experiences, stunning landscapes, gorgeous food and drink and a very warm welcome are all ready and waiting. After a couple of nights in Belfast, (read my city guide here) I escaped to Fermanagh for a little adventure, with equal amounts of relaxation....

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9th August 2020 by The Daily S'elf

Belfast staycation

At a time when we’re all looking for staycation inspiration, it can be easy to overlook cities in favour of heading to the beach. But considering just about everyone else has had the same idea, now is actually a great time to find good value on hotels and eating out, especially in Northern Ireland. When looking for places to go near me, a Belfast staycation was an obvious choice - no need for an epic trek, just two hours in the car from Dublin....

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9th November 2019 by The Daily S'elf

How to spend 3 days in County Down

I’m guilty of heading west every time I fancy a coastal staycation in Ireland, but fresh off the back of my most recent trip (Insta highlights here), I’m bringing you my ‘how to spend 3 days in County Down’ itinerary. I’m not the biggest fan of long road journeys, or spending too long in the car so the fact that the whole region is less than two hours from Dublin really appealed to me. There is so much to see and do in terms of amazing food and drink all across the island of...

Weather in Northern Ireland

Our month-by-month guide to the weather and climate in Northern Ireland

4.1

Northern Ireland weather in

January
5.0

Northern Ireland weather in

February
7.5

Northern Ireland weather in

March
10.4

Northern Ireland weather in

April
12.7

Northern Ireland weather in

May
15.6

Northern Ireland weather in

June
17.0

Northern Ireland weather in

July
16.4

Northern Ireland weather in

August
14.5

Northern Ireland weather in

September
11.2

Northern Ireland weather in

October
7.4

Northern Ireland weather in

November
4.8

Northern Ireland weather in

December