Hillsborough weather in September 2026

Q: How warm is it in Hillsborough in September?

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

Q: How sunny is it in Hillsborough in September?

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

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

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

Q: Does it rain in Hillsborough in September?

There are usually 17 days with some rain in Hillsborough in September and the average monthly rainfall is 94mm.

Expect daytime maximum temperatures of 61°F in Hillsborough, 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 3.9 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
3.9
3.9 inches of monthly rainfall
3
3 (Moderate) UV index

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The September weather guide for Northern Ireland (Hillsborough) 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 Hillsborough in September?

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

How sunny is it in Hillsborough in September?

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

How warm is the sea around Hillsborough in September?

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

Does it rain in Hillsborough in September?

There are usually 17 days with some rain in Hillsborough in September and the average monthly rainfall is 3.7 inches.

Hillsborough September sunrise & sunset times

Browse the sunrise and sunset times for Hillsborough in September 2026. Select a month to view Hillsborough sunrise and sunset times for the next 12 months.

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