Porthmadog weather live forecast

Today's maximum temperature in Porthmadog is expected to be 11°C. Select a day from the live weather forecast for Porthmadog, Wales, UK for more weather parameters.

Sunday
17th May
11

8

2

3
Monday
18th May
13

8

2

5
Tuesday
19th May
14

10

1

2
Wednesday
20th May
14

11

2

3
Thursday
21st May
15

10

1

3

5-day weather forecast updated at 04:03 on Sunday 17th May 2026 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 17th May 2026

Expect mostly cloudy with rain in Porthmadog, Wales with a maximum temperature of 11°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of rainfall expected with 86% chance of some rain and a moderate breeze of 25 kph from the south-west.

11
°C maximum temperature
8
°C minimum temperature
mostly cloudy with rain
2
hours of sunshine
3
UV index (Moderate)
86
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
25
kph wind from SW

Porthmadog weather for Monday 18th May 2026

Expect mostly cloudy with rain in Porthmadog, Wales with a maximum temperature of 13°C, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of rainfall expected with 81% chance of some rain and a gentle breeze of 18 kph from the south-west.

13
°C maximum temperature
8
°C minimum temperature
mostly cloudy with rain
2
hours of sunshine
5
UV index (Moderate)
81
% chance of some rain
<10
mm of rainfall expected
13
°C wind chill
18
kph wind from SW

Porthmadog weather for Tuesday 19th May 2026

Expect cloudy with some rain in Porthmadog, Wales with a maximum temperature of 14°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 95% chance of some rain and a strong breeze of 40 kph from the south-west.

14
°C maximum temperature
10
°C minimum temperature
cloudy with some rain
1
hour of sunshine
2
UV index (Low)
95
% chance of some rain
<20
mm of rainfall expected
14
°C wind chill
40
kph wind from SW

Porthmadog weather for Wednesday 20th May 2026

Expect mostly cloudy with rain in Porthmadog, Wales with a maximum temperature of 14°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of rainfall expected with 57% chance of some rain and a fresh breeze of 30 kph from the south-west.

14
°C maximum temperature
11
°C minimum temperature
mostly cloudy with rain
2
hours of sunshine
3
UV index (Moderate)
57
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
30
kph wind from SW

Porthmadog weather for Thursday 21st May 2026

Expect cloudy with some rain in Porthmadog, Wales with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 38% chance of some rain and a moderate breeze of 23 kph from the south-west.