Climate and monthly weather forecastPorthmadog, United Kingdom
Porthmadog, United Kingdom - Climate and weather forecast by month. Detailed climate information with charts - average monthly weather with temperature, pressure, humidity, precipitation, wind, daylight, sunshine, visibility, and UV index data. January through April, November and December are months with snowfall in Porthmadog, United Kingdom. The month with the warmest seawater in Porthmadog, United Kingdom, is September, with an average sea temperature of 15.7°C (60.3°F).
Climate and monthly weather forecast
Weather in January
January, like December, in Porthmadog, United Kingdom, is an icy winter month, with an average temperature varying between 5.6°C (42.1°F) and 1.9°C (35.4°F). January stands out as Porthmadog's coldest month, with temperatures ranging between an average high of 5.6°C (42.1°F) and a low of 1.9°C (35.4°F). Weather in January »Weather in February
The last month of the winter, February, is another cold month in Porthmadog, United Kingdom, with temperature in the range of an average high of 5.9°C (42.6°F) and an average low of 1.5°C (34.7°F). As Porthmadog steps into February, the average high-temperature holds at a still cold 5.9°C (42.6°F), hinting at a minor fluctuation from the prior month. Weather in February »Weather in March
March, the first month of the spring in Porthmadog, is a chilly month, with temperature in the range of an average low of 1.9°C (35.4°F) and an average high of 8.1°C (46.6°F). March's onset records an average high-temperature of a chilly 8.1°C (46.6°F), a near match to February's 5.9°C (42.6°F). Weather in March »Weather in April
April in Porthmadog, United Kingdom, is a fresh spring month, with temperature in the range of an average low of 3.9°C (39°F) and an average high of 11°C (51.8°F). Porthmadog observes a minor difference in average high-temperatures between March's 8.1°C (46.6°F) and April's 11°C (51.8°F). Weather in April »Weather in May
The last month of the spring, May, is a mild month in Porthmadog, United Kingdom, with an average temperature fluctuating between 6.1°C (43°F) and 13.6°C (56.5°F). The average high-temperature during May registers at a refreshing 13.6°C (56.5°F), closely corresponding to the preceding month. Weather in May »Weather in June
June, the first month of the summer in Porthmadog, is still a mild month, with an average temperature fluctuating between 15.9°C (60.6°F) and 8.5°C (47.3°F). With the advent of June, Porthmadog's high-temperatures adjust to a still mild 15.9°C (60.6°F), closely aligning with the preceding month. Weather in June »Weather in July
July is a refreshing summer month in Porthmadog, United Kingdom, with an average temperature varying between 17.2°C (63°F) and 10.3°C (50.5°F). In Porthmadog, United Kingdom, the average temperatures in July are the highest, with a peak at 17.2°C (63°F) and a low of 10.3°C (50.5°F). Weather in July »Weather in August
August, the last month of the summer in Porthmadog, is another refreshing month, with temperature in the range of an average low of 10.6°C (51.1°F) and an average high of 16.5°C (61.7°F). The transition into August notes an average high-temperature of a still enjoyable 16.5°C (61.7°F), revealing a mild distinction from the 17.2°C (63°F) in July. Weather in August »Weather in September
The first month of the autumn, September, is still a mild month in Porthmadog, United Kingdom, with temperature in the range of an average high of 14.8°C (58.6°F) and an average low of 8.7°C (47.7°F). During September, Porthmadog records an average high-temperature of a mild 14.8°C (58.6°F), marking a slight divergence from August's 16.5°C (61.7°F). Weather in September »Weather in October
October, like September, in Porthmadog, United Kingdom, is a cool autumn month, with an average temperature ranging between min 7.2°C (45°F) and max 12.1°C (53.8°F). With the advent of October, Porthmadog's high-temperatures adjust to a cool 12.1°C (53.8°F), closely aligning with the preceding month. Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Porthmadog, United Kingdom, with an average temperature fluctuating between 8.5°C (47.3°F) and 4.6°C (40.3°F). Transitioning from October to November involves a subtle drop in average high-temperatures, descending from a fresh 12.1°C (53.8°F) to a frosty 8.5°C (47.3°F). Weather in November »Weather in December
The first month of the winter, December, is still a chilly month in Porthmadog, United Kingdom, with an average temperature fluctuating between 3°C (37.4°F) and 6.6°C (43.9°F). The arrival of December is marked by an average high-temperature of a still frosty 6.6°C (43.9°F), bearing a close resemblance to November. Weather in December »Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature
Porthmadog, United Kingdom
The warmest month (with the highest average high temperature) is July (17.2°C).
The month with the lowest average high temperature is January (5.6°C).
The month with the highest average low temperature is August (10.6°C).
The coldest month (with the lowest average low temperature) is February (1.5°C).
Average pressure
Porthmadog, United Kingdom
- Average pressure in January:
1012.6mbar - Average pressure in February:
1012.1mbar - Average pressure in March:
1014.6mbar - Average pressure in April:
1015.1mbar - Average pressure in May:
1016.3mbar - Average pressure in June:
1015.4mbar
- Average pressure in July:
1014.3mbar - Average pressure in August:
1013.5mbar - Average pressure in September:
1015.9mbar - Average pressure in October:
1013.7mbar - Average pressure in November:
1009.1mbar - Average pressure in December:
1012.3mbar
The month with the highest atmospheric pressure is May (1016.3mbar).
The month with the lowest atmospheric pressure is November (1009.1mbar).
Average wind speed
Porthmadog, United Kingdom
- Average wind speed in January:
16.8km/h - Average wind speed in February:
17km/h - Average wind speed in March:
15km/h - Average wind speed in April:
12.3km/h - Average wind speed in May:
12.5km/h - Average wind speed in June:
11.2km/h
- Average wind speed in July:
11.5km/h - Average wind speed in August:
12.7km/h - Average wind speed in September:
12.7km/h - Average wind speed in October:
14.1km/h - Average wind speed in November:
15.5km/h - Average wind speed in December:
17.8km/h
The windiest month (with the highest average wind speed) is December (17.8km/h).
The calmest month (with the lowest average wind speed) is June (11.2km/h).
Average humidity
Porthmadog, United Kingdom
The months with the highest relative humidity are January and December (91%).
The months with the lowest relative humidity are April and May (84%).
Average rainfall
Porthmadog, United Kingdom
The wettest month (with the highest rainfall) is December (103mm).
The driest months (with the least rainfall) are April and May (52mm).
Average rainfall days
Porthmadog, United Kingdom
- Average rainfall days in January:
18.7 days - Average rainfall days in February:
15.3 days - Average rainfall days in March:
16.5 days - Average rainfall days in April:
17.4 days - Average rainfall days in May:
19.4 days - Average rainfall days in June:
18.5 days
- Average rainfall days in July:
21.8 days - Average rainfall days in August:
22.4 days - Average rainfall days in September:
18.3 days - Average rainfall days in October:
19.5 days - Average rainfall days in November:
21.4 days - Average rainfall days in December:
20.8 days
The month with the highest number of rainy days is August (22.4 days).
The month with the least rainy days is February (15.3 days).
Average snowfall
Porthmadog, United Kingdom
The month with the highest snowfall is January (70mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days
Porthmadog, United Kingdom
- Average snowfall days in January:
6.1 days - Average snowfall days in February:
6.7 days - Average snowfall days in March:
3.4 days - Average snowfall days in April:
0.8 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1.4 days - Average snowfall days in December:
3.9 days
The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature
Porthmadog, United Kingdom
The best month for swimming (with the highest average sea temperature) is September (15.7°C).
The coldest months (with the lowest average sea temperature) are February and March (8.3°C).
Average daylight / Average sunshine
Porthmadog, United Kingdom
- Average daylight in January:
8h and 12min - Average daylight in February:
9h and 54min - Average daylight in March:
11h and 54min - Average daylight in April:
14h and 0min - Average daylight in May:
15h and 48min - Average daylight in June:
16h and 48min
- Average daylight in July:
16h and 18min - Average daylight in August:
14h and 42min - Average daylight in September:
12h and 42min - Average daylight in October:
10h and 36min - Average daylight in November:
8h and 42min - Average daylight in December:
7h and 42min
The month with the longest days is June (Average daylight: 16h and 48min).
The month with the shortest days is December (Average daylight: 7h and 42min).
- Average sunshine in January:
2h and 48min - Average sunshine in February:
2h and 48min - Average sunshine in March:
4h and 36min - Average sunshine in April:
6h and 0min - Average sunshine in May:
6h and 12min - Average sunshine in June:
6h and 12min
- Average sunshine in July:
6h and 0min - Average sunshine in August:
5h and 12min - Average sunshine in September:
4h and 54min - Average sunshine in October:
3h and 6min - Average sunshine in November:
2h and 42min - Average sunshine in December:
2h and 30min
The months with the most sunshine are May and June (Average sunshine: 6h and 12min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days
Porthmadog, United Kingdom
- Average sunshine days in January:
7 days - Average sunshine days in February:
7.8 days - Average sunshine days in March:
10.8 days - Average sunshine days in April:
9.9 days - Average sunshine days in May:
9.1 days - Average sunshine days in June:
9.1 days
- Average sunshine days in July:
7.1 days - Average sunshine days in August:
5.9 days - Average sunshine days in September:
8.5 days - Average sunshine days in October:
8.4 days - Average sunshine days in November:
6 days - Average sunshine days in December:
6.5 days
The month with the most sunshine days is March (10.8 days).
The month with the least sunshine days is August (5.9 days).
Average UV index
Porthmadog, United Kingdom
The months with the highest UV index are May, June and August (UV index 4).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).
Average cloud cover
Porthmadog, United Kingdom
The month with the most cloud cover is December (Cloud cover 76).
The month with the least cloud cover is April (Cloud cover 60).
Average visibility
Porthmadog, United Kingdom
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (8km).
The months with the lowest visibility are August and September (7km).
