Hillsborough weather in September 2025

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°C maximum daytime temperature in September in Hillsborough16
    16°C max day temperature
  • 4 hours of sunshine per day
  • 17 days with some rainfall in September in Hillsborough17
    17 days with some rainfall
  • 9°C minimum night-time temperature in September in Hillsborough9
    9°C min night temperature
  • 13 hours of daylight per day in September in Hillsborough13
    13 hours of daylight per day
  • No heat & humidity in September in Hillsborough0
    No heat & humidity
  • 100 mm monthly rainfall in September in Hillsborough100
    100 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Hillsborough3
    3 (Moderate) UV index

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Hillsborough by month

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Recommended for Northern Ireland

  • Kids stay & eat for free at Marriot Bonvoy
  • Destinations include Europe, Middle East & Africa
  • Valid for up to 2 adults & 2 kids aged up to 12

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)

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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.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:32 19:15
Monday, 15th September 2025 05:57 18:40
Tuesday, 30th September 2025 06:25 18:02

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