Climate and monthly weather forecastCarmarthen, United Kingdom
Climate and monthly weather forecast
Weather in January
January, the same as December, in Carmarthen, United Kingdom, is another chilly winter month, with an average temperature fluctuating between 4°C (39.2°F) and 7.7°C (45.9°F). January's beginning signals an average high-temperature of a still chilly 7.7°C (45.9°F), barely different from December's 8.6°C (47.5°F). Weather in January »Weather in February
February, the last month of the winter in Carmarthen, is another chilly month, with temperature in the range of an average high of 7.6°C (45.7°F) and an average low of 3.9°C (39°F). February, with its average high-temperature of 7.6°C (45.7°F) and an average low-temperature of 3.9°C (39°F), holds the record as the coldest month. Weather in February »Weather in March
The first month of the spring, March, is still a chilly month in Carmarthen, United Kingdom, with temperature in the range of an average high of 9.3°C (48.7°F) and an average low of 4.2°C (39.6°F). March's average high-temperature is a still frosty 9.3°C (48.7°F), maintaining a close comparison with February's 7.6°C (45.7°F). Weather in March »Weather in April
April in Carmarthen, United Kingdom, is a cool spring month, with an average temperature varying between 11.9°C (53.4°F) and 5.9°C (42.6°F). Carmarthen records an average high-temperature of a fresh 11.9°C (53.4°F) as April arrives, nearly mirroring the previous month's climate. Weather in April »Weather in May
May, the last month of the spring in Carmarthen, is a mild month, with an average temperature fluctuating between 7.9°C (46.2°F) and 14.1°C (57.4°F). The transition into May is marked with an average high-temperature of a mild 14.1°C (57.4°F), showing an insignificant shift from April's 11.9°C (53.4°F). Weather in May »Weather in June
The first month of the summer, June, is an enjoyable month in Carmarthen, United Kingdom, with an average temperature ranging between min 10.6°C (51.1°F) and max 16.8°C (62.2°F). Carmarthen's entry into June measures an average high-temperature of a comfortable 16.8°C (62.2°F), closely parallel to the preceding month. Weather in June »Weather in July
July, like June, in Carmarthen, United Kingdom, is another enjoyable summer month, with temperature in the range of an average high of 17.9°C (64.2°F) and an average low of 12.3°C (54.1°F). With average temperatures fluctuating between a high of 17.9°C (64.2°F) and a low of 12.3°C (54.1°F), July stands out as the warmest month. Weather in July »Weather in August
August, the last month of the summer in Carmarthen, is also an enjoyable month, with an average temperature varying between 17.5°C (63.5°F) and 12.8°C (55°F). The transition from July to August sees average high-temperatures adjusting to a still comfortable 17.5°C (63.5°F), from a not significantly different 17.9°C (64.2°F). Weather in August »Weather in September
September, the first month of the autumn in Carmarthen, is still a refreshing month, with temperature in the range of an average low of 11.4°C (52.5°F) and an average high of 16.2°C (61.2°F). The advent of September brings an average high-temperature of a still comfortable 16.2°C (61.2°F), exhibiting minor difference from the previous month. Weather in September »Weather in October
October, like September, is another refreshing autumn month in Carmarthen, United Kingdom, with an average temperature ranging between max 13.7°C (56.7°F) and min 9.7°C (49.5°F). Carmarthen notes an average high-temperature of a still refreshing 13.7°C (56.7°F) in October, displaying minor variation from September. Weather in October »Weather in November
November, the last month of the autumn in Carmarthen, is also a fresh month, with an average temperature fluctuating between 7°C (44.6°F) and 10.4°C (50.7°F). The transition into November is accompanied by a slight temperature decrease, with the average high-temperature shifting from a moderate 13.7°C (56.7°F) in October to a cool 10.4°C (50.7°F). Weather in November »Weather in December
December, the first month of the winter in Carmarthen, is also a frosty month, with temperature in the range of an average high of 8.6°C (47.5°F) and an average low of 5.4°C (41.7°F). As December takes its course, Carmarthen's average high-temperature registers at a chilly 8.6°C (47.5°F), closely aligning with the preceding month. Weather in December »Updated: Feb 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With an average relative humidity of 87%, January is the most humid month.
Throughout the year, in Carmarthen, there are 210.2 rainfall days, and 515mm (20.28") of precipitation is accumulated.
Months with snowfall in Carmarthen, United Kingdom, are January, February, November and December.
Throughout the year, in Carmarthen, there are 3.9 snowfall days, and 15mm (0.59") of snow is accumulated.
The month with the least sunshine in Carmarthen is January, with an average of 3.6h of sunshine.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Carmarthen, United Kingdom.
Carmarthen's February weather reaches an average high of 7.6°C (45.7°F) and an average low of 3.9°C (39°F), making it the coldest month.
February is the month with the most snowfall. Snow falls for 1.3 days and accumulates 7mm (0.28") of snow.
In Carmarthen, snow does not fall in March through October.
April and May, with an average relative humidity of 82%, are the least humid months in Carmarthen, United Kingdom.
The month with the least rainfall in Carmarthen is May, when the rain falls for 15.2 days and typically collects 24mm (0.94") of precipitation.
The month with the most sunshine is May, with an average of 8h of sunshine.
The months with the highest UV index in Carmarthen are May through September, with an average maximum UV index of 4.
June has the longest days of the year, with an average of 16h and 36min of daylight.
July is the month when Carmarthen, United Kingdom, sees the average highest temperatures, with a high of 17.9°C (64.2°F) and a low of 12.3°C (54.1°F).
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Carmarthen, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to BST.
The month with the most rainfall in Carmarthen, United Kingdom, is November, when the rain falls for 19.7 days and typically aggregates up to 60mm (2.36") of precipitation.
With an average of 7h and 54min of daylight, December has the shortest days of the year in Carmarthen, United Kingdom.
Average temperature
Carmarthen, United Kingdom
The warmest month (with the highest average high temperature) is July (17.9°C).
The month with the lowest average high temperature is February (7.6°C).
The month with the highest average low temperature is August (12.8°C).
The coldest month (with the lowest average low temperature) is February (3.9°C).
Average pressure
Carmarthen, United Kingdom
- Average pressure in January:
1013.5mbar - Average pressure in February:
1013mbar - Average pressure in March:
1015.1mbar - Average pressure in April:
1015.2mbar - Average pressure in May:
1016.6mbar - Average pressure in June:
1015.9mbar
- Average pressure in July:
1015mbar - Average pressure in August:
1014.4mbar - Average pressure in September:
1016.6mbar - Average pressure in October:
1014.2mbar - Average pressure in November:
1009.6mbar - Average pressure in December:
1013.5mbar
The months with the highest atmospheric pressure are May and September (1016.6mbar).
The month with the lowest atmospheric pressure is November (1009.6mbar).
Average wind speed
Carmarthen, United Kingdom
- Average wind speed in January:
21.3km/h - Average wind speed in February:
21.7km/h - Average wind speed in March:
18.8km/h - Average wind speed in April:
15.7km/h - Average wind speed in May:
15.2km/h - Average wind speed in June:
14.5km/h
- Average wind speed in July:
14.7km/h - Average wind speed in August:
16.2km/h - Average wind speed in September:
16.9km/h - Average wind speed in October:
18.9km/h - Average wind speed in November:
20.9km/h - Average wind speed in December:
22.3km/h
The windiest month (with the highest average wind speed) is December (22.3km/h).
The calmest month (with the lowest average wind speed) is June (14.5km/h).
Average humidity
Carmarthen, United Kingdom
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and May (82%).
Average rainfall
Carmarthen, United Kingdom
The wettest month (with the highest rainfall) is November (60mm).
The driest month (with the least rainfall) is May (24mm).
Average rainfall days
Carmarthen, United Kingdom
- Average rainfall days in January:
20 days - Average rainfall days in February:
15.6 days - Average rainfall days in March:
15.3 days - Average rainfall days in April:
13.5 days - Average rainfall days in May:
15.2 days - Average rainfall days in June:
16.6 days
- Average rainfall days in July:
19.8 days - Average rainfall days in August:
20.4 days - Average rainfall days in September:
15.8 days - Average rainfall days in October:
17.7 days - Average rainfall days in November:
19.7 days - Average rainfall days in December:
20.6 days
The month with the highest number of rainy days is December (20.6 days).
The month with the least rainy days is April (13.5 days).
Average snowfall
Carmarthen, United Kingdom
The month with the highest snowfall is February (7mm).
The months with the least snowfall are March, April, May, June, July, August, September and October (0mm).
Average snowfall days
Carmarthen, United Kingdom
- Average snowfall days in January:
1.2 days - Average snowfall days in February:
1.3 days - Average snowfall days in March:
0.1 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 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 days - Average snowfall days in November:
0.4 days - Average snowfall days in December:
0.9 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Carmarthen, United Kingdom
- Average daylight in January:
8h and 24min - Average daylight in February:
10h and 0min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 54min - Average daylight in May:
15h and 42min - Average daylight in June:
16h and 36min
- Average daylight in July:
16h and 12min - Average daylight in August:
14h and 36min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 36min - Average daylight in November:
8h and 48min - Average daylight in December:
7h and 54min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in January:
3h and 36min - Average sunshine in February:
3h and 42min - Average sunshine in March:
5h and 48min - Average sunshine in April:
7h and 54min - Average sunshine in May:
8h and 0min - Average sunshine in June:
7h and 42min
- Average sunshine in July:
7h and 30min - Average sunshine in August:
7h and 6min - Average sunshine in September:
6h and 48min - Average sunshine in October:
4h and 24min - Average sunshine in November:
3h and 54min - Average sunshine in December:
3h and 42min
The month with the most sunshine is May (Average sunshine: 8h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Carmarthen, United Kingdom
- Average sunshine days in January:
8.2 days - Average sunshine days in February:
9 days - Average sunshine days in March:
13.2 days - Average sunshine days in April:
13.1 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
9.8 days
- Average sunshine days in July:
7.9 days - Average sunshine days in August:
6.3 days - Average sunshine days in September:
10 days - Average sunshine days in October:
8.6 days - Average sunshine days in November:
7.5 days - Average sunshine days in December:
6.6 days
The month with the most sunshine days is March (13.2 days).
The month with the least sunshine days is August (6.3 days).
Average UV index
Carmarthen, United Kingdom
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Carmarthen, United Kingdom
The month with the most cloud cover is December (Cloud cover 64).
The months with the least cloud cover are April and May (Cloud cover 48).
Average visibility
Carmarthen, United Kingdom
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
