Porthmadog weather in August 2025

Expect daytime maximum temperatures of 18°C in Porthmadog in August based on long-term weather averages. There are 5 hours of sunshine per day on average with 16 days with some rainfall and typically 135 mm of rainfall in the month.

  • 18°C maximum daytime temperature in August in Porthmadog18
    18°C max day temperature
  • 5 hours of sunshine per day
  • 16 days with some rainfall in August in Porthmadog16
    16 days with some rainfall
  • 11°C minimum night-time temperature in August in Porthmadog11
    11°C min night temperature
  • 15 hours of daylight per day in August in Porthmadog15
    15 hours of daylight per day
  • No heat & humidity in August in Porthmadog0
    No heat & humidity
  • 135 mm monthly rainfall in August in Porthmadog135
    135 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in August in Porthmadog5
    5 (Moderate) UV index
  • 17°C sea temperature in August in Porthmadog17
    17°C sea temperature

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The August weather guide for Wales (Porthmadog) 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 Wales

How hot is it in Porthmadog in August?

Daytime temperatures usually reach 18°C in Porthmadog in August, falling to 11°C at night.

How sunny is it in Porthmadog in August?

There are normally 5 hours of bright sunshine each day in Porthmadog in August - that's 35% of daylight hours.

How warm is the sea around Porthmadog in August?

The average sea temperature around Porthmadog in August is 17°C.

Does it rain in Porthmadog in August?

There are usually 16 days with some rain in Porthmadog in August and the average monthly rainfall is 135mm.

Porthmadog August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:35 20:10
Saturday, 16th August 2025 05:00 19:41
Sunday, 31st August 2025 05:25 19:07

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