Porthmadog weather in May 2025

Expect daytime maximum temperatures of 14°C in Porthmadog, Wales in May based on long-term weather averages. There are 6 hours of sunshine per day on average with 16 days with some rainfall and typically 96 mm of rainfall in the month.

  • 14°C maximum daytime temperature in May in Porthmadog14
    14°C max day temperature
  • 6 hours of sunshine per day
  • 16 days with some rainfall in May in Porthmadog16
    16 days with some rainfall
  • 6°C minimum night-time temperature in May in Porthmadog6
    6°C min night temperature
  • 16 hours of daylight per day in May in Porthmadog16
    16 hours of daylight per day
  • No heat & humidity in May in Porthmadog0
    No heat & humidity
  • 96 mm monthly rainfall in May in Porthmadog96
    96 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in May in Porthmadog5
    5 (Moderate) UV index
  • 12°C sea temperature in May in Porthmadog12
    12°C sea temperature

More about Porthmadog

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The May 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 warm is it in Porthmadog in May?

Daytime temperatures usually reach 14°C in Porthmadog in May, falling to 6°C at night.

How sunny is it in Porthmadog in May?

There are normally 6 hours of bright sunshine each day in Porthmadog in May - that's 38% of daylight hours.

How warm is the sea around Porthmadog in May?

The average sea temperature around Porthmadog in May is 12°C.

Does it rain in Porthmadog in May?

There are usually 16 days with some rain in Porthmadog in May and the average monthly rainfall is 96mm.

Porthmadog May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:43 19:45
Friday, 16th May 2025 04:17 20:10
Saturday, 31st May 2025 03:58 20:31

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