Porthmadog weather live forecast

Today's maximum temperature in Porthmadog is expected to be 18°C. Select a day from the live weather forecast for Porthmadog, Wales, UK for more weather parameters.

Sunday
30th Aug
18

14

1

2
Monday
31st Aug
17

13

3

2
Tuesday
1st Sep
19

13

4

2
Wednesday
2nd Sep
19

15

5

3
Thursday
3rd Sep
20

14

1

4

5-day weather forecast updated at 04:03 on Saturday 29th August 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 30th August 2026

Expect isolated thunderstorms in Porthmadog, Wales with a maximum temperature of 18°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 99% chance of some rain and a moderate breeze of 20 kph from the south-west.

18
°C maximum temperature
14
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
2
UV index (Low)
99
% chance of some rain
<20
mm of rainfall expected
18
°C wind chill
20
kph wind from SW

Porthmadog weather for Monday 31st August 2026

Expect isolated thunderstorms in Porthmadog, Wales with a maximum temperature of 17°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 61% chance of some rain and a moderate breeze of 28 kph from the west.

17
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
2
UV index (Low)
61
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
28
kph wind from W

Porthmadog weather for Tuesday 1st September 2026

Expect mostly cloudy with light rain in Porthmadog, Wales with a maximum temperature of 19°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 64% chance of some rain and a fresh breeze of 30 kph from the south-west.

19
°C maximum temperature
13
°C minimum temperature
mostly cloudy with light rain
4
hours of sunshine
2
UV index (Low)
64
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
30
kph wind from SW

Porthmadog weather for Wednesday 2nd September 2026

Expect mostly cloudy with rain in Porthmadog, Wales with a maximum temperature of 19°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 72% chance of some rain and a fresh breeze of 36 kph from the south-west.

19
°C maximum temperature
15
°C minimum temperature
mostly cloudy with rain
5
hours of sunshine
3
UV index (Moderate)
72
% chance of some rain
<20
mm of rainfall expected
19
°C wind chill
36
kph wind from SW

Porthmadog weather for Thursday 3rd September 2026

Expect mostly cloudy with light rain in Porthmadog, Wales with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 89% chance of some rain and a strong breeze of 42 kph from the south-west.