Hillsborough weather in September 2025

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: 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 100mm.

Expect 16°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Hillsborough in September. Check more long-term weather averages for Hillsborough in September before you book your next holiday to Northern Ireland in 2025/2026.

16
16°C max day temperature
4
4 hours of sunshine per day
17
17 days with some rainfall
9
9°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
100
100 mm 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 / mm) | Imperial (°F / inches)

More about the UK

How warm is it in Hillsborough in September?

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

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 100mm.

Hillsborough September sunrise & sunset times

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

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