Portstewart weather in August 2025

Expect 17°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Portstewart in August. Check more long-term weather averages for Portstewart in August before you book your next holiday to Northern Ireland in 2025/2026.

  • 17°C maximum daytime temperature in August in Portstewart17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 19 days with some rainfall in August in Portstewart19
    19 days with some rainfall
  • 10°C minimum night-time temperature in August in Portstewart10
    10°C min night temperature
  • 15 hours of daylight per day in August in Portstewart15
    15 hours of daylight per day
  • No heat & humidity in August in Portstewart0
    No heat & humidity
  • 92 mm monthly rainfall in August in Portstewart92
    92 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in August in Portstewart5
    5 (Moderate) UV index
  • 14°C sea temperature in August in Portstewart14
    14°C sea temperature

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The August weather guide for Northern Ireland (Portstewart) 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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How warm is it in Portstewart in August?

Daytime temperatures usually reach 17°C in Portstewart in August, falling to 10°C at night.

How sunny is it in Portstewart in August?

There are normally 4 hours of bright sunshine each day in Portstewart in August - that's 28% of daylight hours.

How warm is the sea around Portstewart in August?

The average sea temperature around Portstewart in August is 14°C.

Does it rain in Portstewart in August?

There are usually 19 days with some rain in Portstewart in August and the average monthly rainfall is 92mm.

Portstewart August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:35 20:30
Saturday, 16th August 2025 05:03 19:58
Sunday, 31st August 2025 05:31 19:22

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