Weather Porthmadog

Daily forecast
Day Weather Maximum Day Temperature Minimum Night Temperature Wind Direction and Speed

Heavy Rain

14°C 57°F 10°C 50°F West South Westerly
31km/h 19mph

Sunny Intervals

15°C 59°F 9°C 48°F North Westerly
21km/h 13mph


15°C 59°F 8°C 46°F West North Westerly
19km/h 12mph

Light Cloud

16°C 61°F 13°C 55°F Southerly
21km/h 13mph

Light Rain Shower

17°C 63°F 14°C 57°F South South Westerly
19km/h 12mph



Sunrise 06:07 Sunset 20:31

Last updated 10:14

Weather forecast details for Thursday 21 August. Each column contains hourly forecast details for weather conditions, temperature, wind speed, wind direction, humidity, visibility and pressure.
Time 1300 hours1600 hours1900 hours2200 hours0100 hours
0400 hours  
Weather Conditions Heavy Rain Heavy Rain Light Rain Light Cloud Partly Cloudy Partly Cloudy   
Temperature (°C/°F) 13°C 55°F 13°C 55°F 14°C 57°F 13°C 55°F 12°C 54°F 11°C 52°F   
Wind Speed (mph/km/h) 31km/h 19mph West South Westerly 27km/h 17mph West South Westerly 26km/h 16mph West South Westerly 14km/h 9mph Westerly 11km/h 7mph North Westerly 13km/h 8mph North Westerly   
Wind Direction WSW WSW WSW W NW NW   
Humidity 83% 91% 89% 90% 89% 89%   
Visibility (E = Excellent, VG = Very Good, G = Good, M = Moderate, P = Poor, VP = Very Poor) G M VG VG VG VG   
Pressure (Millibars) 1012 1010 1009 1009 1009 1009   


Forecast Summary

  • Today

    A chilly but generally bright start, with the odd shower. It is going to turn cloudier through the day as outbreaks of rain slowly spread their way southwards this afternoon. Temperatures still slightly below average for the time of year.

  • Tonight

    Most of the outbreaks of rain should clear away during the first part of the night leaving it largely dry with clear spells. A little less chilly than recent nights.

Environmental Summary

UV: 3

UK Range: 1-7

Pollution: Low

UK Range: Low to Very High

Pollen: Low

UK Range: Low to Very High

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Forecast Video

BBC Wales Today

BBC Wales Today Forecast Last updated 06:24, Thursday 21 Aug Forecast updated Monday to Friday only


UK Forecast Last updated 07:48, Thursday 21 Aug


Observed at 11:00, Thursday 21 August

Thick Cloud

12°C 54°F

35km/h 22mph South Westerly

Humidity: 77%

Visibility: Excellent

Pressure: 1013mb, Falling

Observation station: Capel Curig

(Lat: 53.1 | Lon: -3.933)

BBC Weather in association with the Met Office

All times are BST (Europe/London, GMT+0100) unless otherwise stated

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