Wales weather in August 2025

Expect daytime maximum temperatures of 20°C in Wales, UK in August based on long-term weather averages. There are 6 hours of sunshine per day on average with 15 days with some rainfall and typically 81 mm of rainfall in the month.

  • 20°C maximum daytime temperature in August in Wales (Cardiff)20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 15 days with some rainfall in August in Wales (Cardiff)15
    15 days with some rainfall
  • 12°C minimum night-time temperature in August in Wales (Cardiff)12
    12°C min night temperature
  • 15 hours of daylight per day in August in Wales (Cardiff)15
    15 hours of daylight per day
  • No heat & humidity in August in Wales (Cardiff)0
    No heat & humidity
  • 81 mm monthly rainfall in August in Wales (Cardiff)81
    81 mm of monthly rainfall
  • UV (maximum) index 6 (High) in August in Wales (Cardiff)6
    6 (High) UV index
  • 18°C sea temperature in August in Wales (Cardiff)18
    18°C sea temperature

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The August weather guide for Wales (Cardiff) 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.

Top Wales destinations

Below are average maximum temperatures at popular countries, regions and places in Wales in August. Select a holiday destination to see more weather parameters.

All Wales regions

All Wales destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Wales

How hot is it in Wales in August?

Daytime temperatures usually reach 20°C in Cardiff, Wales in August, falling to 12°C at night.

How sunny is it in Wales in August?

There are normally 6 hours of bright sunshine each day in Cardiff, Wales in August - that's 41% of daylight hours.

How warm is the sea around Wales in August?

The average sea temperature around Cardiff, Wales in August is 18°C.

Does it rain in Wales in August?

There are usually 15 days with some rain in Cardiff, Wales in August and the average monthly rainfall is 81mm.

Wales August sunrise & sunset times

Browse the sunrise and sunset times for Wales in August 2025. Select a month to view Wales sunrise and sunset times for the next 12 months. The Wales sunrise and sunset times shown below are for Cardiff.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:37 20:00
Saturday, 16th August 2025 05:00 19:33
Sunday, 31st August 2025 05:24 19:01

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