Porthmadog weather live forecast

Today's maximum temperature in Porthmadog is expected to be 16°C. Select a day from the live weather forecast for Porthmadog, Wales, UK for more weather parameters.

5-day weather forecast updated at 04:05 on Friday 5th September 2025 GMT

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The 5-day weather forecast for Wales (Porthmadog) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Porthmadog weather forecast by day

Below are the detailed weather forecasts for Porthmadog for the next 5 days.

Porthmadog weather for Friday 5th September 2025

Expect mostly cloudy with light rain in Porthmadog, Wales with a maximum temperature of 16°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 18 kph from the south-west.

  • 16°C maximum temperature16
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 25% chance of some rain25
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 18 kph from the South-West18
    kph wind from SW

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Porthmadog weather for Saturday 6th September 2025

Expect broken clouds in Porthmadog, Wales with a maximum temperature of 20°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 27 kph from the south-east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 27 kph from the South-East27
    kph wind from SE

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Porthmadog weather for Sunday 7th September 2025

Expect isolated thunderstorms in Porthmadog, Wales with a maximum temperature of 20°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 81% chance of some rain and a fresh breeze of 29 kph from the south-west.

  • 20°C maximum temperature20
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 81% chance of some rain81
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 20°C wind chill20
    °C wind chill
  • Fresh breeze of 29 kph from the South-West29
    kph wind from SW

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Porthmadog weather for Monday 8th September 2025

Expect mostly cloudy with rain in Porthmadog, Wales with a maximum temperature of 18°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 10-20 mm of rainfall expected with 87% chance of some rain and a strong breeze of 40 kph from the south.

  • 18°C maximum temperature18
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 87% chance of some rain87
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 18°C wind chill18
    °C wind chill
  • Strong breeze of 40 kph from the South40
    kph wind from S

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Porthmadog weather for Tuesday 9th September 2025

Expect mostly cloudy with rain in Porthmadog, Wales with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 87% chance of some rain and a fresh breeze of 31 kph from the south.

  • 18°C maximum temperature18
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 87% chance of some rain87
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 18°C wind chill18
    °C wind chill
  • Fresh breeze of 31 kph from the South31
    kph wind from S

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

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