Porthmadog weather

The Porthmadog weather guide shows monthly weather averages (including daytime and night-time temperatures, rainfall and hours of sunshine) for holidays in Porthmadog, Gwynedd, Wales in 2026/2027.

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Porthmadog weather averages

Check the Porthmadog weather averages for each month of the year including maximum daytime and minimum night-time temperatures, monthly rainfall, number of days with rain and average daily hours of sunshine for Porthmadog, Gwynedd, Wales.

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Porthmadog weather by month

Check the weather for Porthmadog, Gwynedd, Wales for a particular month by selecting from the list below. This gives the best indication of what to expect from the weather months in advance.

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

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Porthmadog weather in January

The average maximum daytime temperature in Porthmadog in January is a cold 7°C (45°F), while the average minimum night-time temperature is a cold 2°C (36°F). You can expect on average 1 hours of sunshine a day in Porthmadog during January.

• 7
  7°C max day temperature
• 1
  1 hour of sunshine per day
• 21
  21 days with some rainfall
• 2
  2°C min night temperature
• 210
  210 mm of monthly rainfall

On average 210 mm (8.3 inches) of rain normally falls in Porthmadog during January with rain falling on 21 days of the month.

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Porthmadog weather in February

The average maximum daytime temperature in Porthmadog in February is a cold 7°C (45°F), while the average minimum night-time temperature is a cold 2°C (36°F). You can expect on average 2 hours of sunshine a day in Porthmadog during February.

• 7
  7°C max day temperature
• 2
  2 hours of sunshine per day
• 17
  17 days with some rainfall
• 2
  2°C min night temperature
• 153
  153 mm of monthly rainfall

On average 153 mm (6 inches) of rain normally falls in Porthmadog during February with rain falling on 17 days of the month.

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Porthmadog weather in March

The average maximum daytime temperature in Porthmadog in March is a cool 9°C (48°F), while the average minimum night-time temperature is a cold 3°C (37°F). You can expect on average 3 hours of sunshine a day in Porthmadog during March.

• 9
  9°C max day temperature
• 3
  3 hours of sunshine per day
• 18
  18 days with some rainfall
• 3
  3°C min night temperature
• 160
  160 mm of monthly rainfall

On average 160 mm (6.3 inches) of rain normally falls in Porthmadog during March with rain falling on 18 days of the month.

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Porthmadog weather in April

The average maximum daytime temperature in Porthmadog in April is a cool 11°C (52°F), while the average minimum night-time temperature is a cold 4°C (39°F). You can expect on average 5 hours of sunshine a day in Porthmadog during April.

• 11
  11°C max day temperature
• 5
  5 hours of sunshine per day
• 16
  16 days with some rainfall
• 4
  4°C min night temperature
• 105
  105 mm of monthly rainfall

On average 105 mm (4.1 inches) of rain normally falls in Porthmadog during April with rain falling on 16 days of the month.

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Porthmadog weather in May

The average maximum daytime temperature in Porthmadog in May is a comfortable 15°C (59°F), while the average minimum night-time temperature is a cold 7°C (45°F). You can expect on average 6 hours of sunshine a day in Porthmadog during May.

• 15
  15°C max day temperature
• 6
  6 hours of sunshine per day
• 15
  15 days with some rainfall
• 7
  7°C min night temperature
• 98
  98 mm of monthly rainfall

On average 98 mm (3.9 inches) of rain normally falls in Porthmadog during May with rain falling on 15 days of the month.

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Porthmadog weather in June

The average maximum daytime temperature in Porthmadog in June is a comfortable 17°C (63°F), while the average minimum night-time temperature is a cool 9°C (48°F). You can expect on average 6 hours of sunshine a day in Porthmadog during June.

• 17
  17°C max day temperature
• 6
  6 hours of sunshine per day
• 14
  14 days with some rainfall
• 9
  9°C min night temperature
• 107
  107 mm of monthly rainfall

On average 107 mm (4.2 inches) of rain normally falls in Porthmadog during June with rain falling on 14 days of the month.

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Porthmadog weather in July

The average maximum daytime temperature in Porthmadog in July is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 11°C (52°F). You can expect on average 5 hours of sunshine a day in Porthmadog during July.

• 19
  19°C max day temperature
• 5
  5 hours of sunshine per day
• 13
  13 days with some rainfall
• 11
  11°C min night temperature
• 98
  98 mm of monthly rainfall

On average 98 mm (3.9 inches) of rain normally falls in Porthmadog during July with rain falling on 13 days of the month.

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Porthmadog weather in August

The average maximum daytime temperature in Porthmadog in August is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 11°C (52°F). You can expect on average 5 hours of sunshine a day in Porthmadog during August.

• 19
  19°C max day temperature
• 5
  5 hours of sunshine per day
• 16
  16 days with some rainfall
• 11
  11°C min night temperature
• 129
  129 mm of monthly rainfall

On average 129 mm (5.1 inches) of rain normally falls in Porthmadog during August with rain falling on 16 days of the month.

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Porthmadog weather in September

The average maximum daytime temperature in Porthmadog in September is a comfortable 17°C (63°F), while the average minimum night-time temperature is a cool 9°C (48°F). You can expect on average 4 hours of sunshine a day in Porthmadog during September.

• 17
  17°C max day temperature
• 4
  4 hours of sunshine per day
• 16
  16 days with some rainfall
• 9
  9°C min night temperature
• 164
  164 mm of monthly rainfall

On average 164 mm (6.5 inches) of rain normally falls in Porthmadog during September with rain falling on 16 days of the month.

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Porthmadog weather in October

The average maximum daytime temperature in Porthmadog in October is a cool 13°C (55°F), while the average minimum night-time temperature is a cold 7°C (45°F). You can expect on average 3 hours of sunshine a day in Porthmadog during October.

• 13
  13°C max day temperature
• 3
  3 hours of sunshine per day
• 18
  18 days with some rainfall
• 7
  7°C min night temperature
• 196
  196 mm of monthly rainfall

On average 196 mm (7.7 inches) of rain normally falls in Porthmadog during October with rain falling on 18 days of the month.

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Porthmadog weather in November

The average maximum daytime temperature in Porthmadog in November is a cool 10°C (50°F), while the average minimum night-time temperature is a cold 4°C (39°F). You can expect on average 2 hours of sunshine a day in Porthmadog during November.

• 10
  10°C max day temperature
• 2
  2 hours of sunshine per day
• 20
  20 days with some rainfall
• 4
  4°C min night temperature
• 206
  206 mm of monthly rainfall

On average 206 mm (8.1 inches) of rain normally falls in Porthmadog during November with rain falling on 20 days of the month.

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Porthmadog weather in December

The average maximum daytime temperature in Porthmadog in December is a cool 8°C (46°F), while the average minimum night-time temperature is a cold 3°C (37°F). You can expect on average 1 hours of sunshine a day in Porthmadog during December.

• 8
  8°C max day temperature
• 1
  1 hour of sunshine per day
• 21
  21 days with some rainfall
• 3
  3°C min night temperature
• 225
  225 mm of monthly rainfall

On average 225 mm (8.9 inches) of rain normally falls in Porthmadog during December with rain falling on 21 days of the month.

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