Carrickfergus weather in September 2025

Q: How warm is it in Carrickfergus in September?

Daytime temperatures usually reach 16°C in Carrickfergus in September, falling to 9°C at night.

Q: How sunny is it in Carrickfergus in September?

There are normally 4 hours of bright sunshine each day in Carrickfergus in September - that's 30% of daylight hours.

Q: How warm is the sea around Carrickfergus in September?

The average sea temperature around Carrickfergus in September is 14°C.

Q: Does it rain in Carrickfergus in September?

There are usually 17 days with some rain in Carrickfergus in September and the average monthly rainfall is 92mm.

Expect daytime maximum temperatures of 61°F in Carrickfergus, Northern Ireland in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 17 days with some rainfall and typically 3.6 inches of rainfall in the month.

61
61°F max day temperature
4
4 hours of sunshine per day
17
17 days with some rainfall
48
48°F min night temperature
13
13 hours of daylight per day
0
No heat & humidity
3.6
3.6 inches of monthly rainfall
3
3 (Moderate) UV index
57
57°F sea temperature

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The September weather guide for Northern Ireland (Carrickfergus) 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.

Metric (°C) | Imperial (°F)

More about the UK

How warm is it in Carrickfergus in September?

Daytime temperatures usually reach 61°F in Carrickfergus in September, falling to 48°F at night.

How sunny is it in Carrickfergus in September?

There are normally 4 hours of bright sunshine each day in Carrickfergus in September - that's 30% of daylight hours.

How warm is the sea around Carrickfergus in September?

The average sea temperature around Carrickfergus in September is 57°F.

Does it rain in Carrickfergus in September?

There are usually 17 days with some rain in Carrickfergus in September and the average monthly rainfall is 3.6 inches.

Carrickfergus September sunrise & sunset times

Browse the sunrise and sunset times for Carrickfergus in September 2025. Select a month to view Carrickfergus sunrise and sunset times for the next 12 months.

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