Porthmadog weather live forecast

Today's maximum temperature in Porthmadog is expected to be 15°C. Select a day from the live weather forecast for Porthmadog, Wales, UK for more weather parameters.

5-day weather forecast updated at 04:04 on Saturday 13th 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 Sunday 14th September 2025

Expect mostly cloudy with rain in Porthmadog, Wales with a maximum temperature of 15°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 99% chance of some rain and a fresh breeze of 38 kph from the south-west.

  • 15°C maximum temperature15
    °C maximum temperature
  • 11°C minimum temperature11
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 99% chance of some rain99
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Fresh breeze of 38 kph from the South-West38
    kph wind from SW

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Porthmadog weather for Monday 15th September 2025

Expect mostly cloudy with light rain in Porthmadog, Wales with a maximum temperature of 16°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 77% chance of some rain and a strong breeze of 46 kph from the west.

  • 16°C maximum temperature16
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 77% chance of some rain77
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 16°C wind chill16
    °C wind chill
  • Strong breeze of 46 kph from the West46
    kph wind from W

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Porthmadog weather for Tuesday 16th September 2025

Expect mostly cloudy with light rain in Porthmadog, Wales with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 82% chance of some rain and a fresh breeze of 33 kph from the west.

  • 15°C maximum temperature15
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 82% chance of some rain82
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 15°C wind chill15
    °C wind chill
  • Fresh breeze of 33 kph from the West33
    kph wind from W

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Porthmadog weather for Wednesday 17th September 2025

Expect mostly cloudy with rain in Porthmadog, Wales with a maximum temperature of 17°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 78% chance of some rain and a strong breeze of 50 kph from the south-west.

  • 17°C maximum temperature17
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 78% chance of some rain78
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Strong breeze of 50 kph from the South-West50
    kph wind from SW

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Porthmadog weather for Thursday 18th September 2025

Expect broken clouds in Porthmadog, Wales with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the west.

  • 15°C maximum temperature15
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours 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 28 kph from the West28
    kph wind from W

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

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