Glamorgan Weather in December

Average temperatures, rainfall, sunshine and the best places to visit in Glamorgan, the United Kingdom in December.

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Cardiff Merthyr Tydfil Bridgend The Mumbles

Planning a trip to Glamorgan, the United Kingdom this December? Here's what you need to know about the weather:

What to Expect in Glamorgan in December

Glamorgan, the United Kingdom is a region in the United Kingdom. December in Glamorgan generally has cold temperatures, with high precipitation. During December, winter is in full swing.

Temperatures

The average maximum temperatures are cold and range from 8°C (46°F) in Merthyr Tydfil to 10°C (50°F) in Llangennith. Nighttime temperatures generally drop to 6°C (43°F) in Llangennith and 2°C (36°F) in Merthyr Tydfil.

For a closer look at conditions across Glamorgan, the United Kingdom, refer to the map below.

Precipitation

In December, precipitation varies across different areas. From high rainfall in Penarth with an average of 107 mm (4.2 in) to high rainfall in Llangennith with 159 mm (6.3 in). Going by our weather data, it is the wettest month of the year in Cardiff.

Average sunshine

Many places experience limited sunshine during this period. Cardiff receives around 49 hours of sunlight. If you prefer more sunny conditions, our weather planner can help you explore other destinations.

Explore Glamorgan by month

Pick a month to see the average temperature, rainfall and sunshine in Glamorgan — and find the best time to visit. (based on Cardiff)

January9°C (48°F) February9°C (48°F) March11°C (52°F) April13°C (55°F) May16°C (61°F) June18°C (64°F) This monthJuly20°C (68°F) August20°C (68°F) September18°C (64°F) October15°C (59°F) November12°C (54°F) December10°C (50°F)
Best Time to Visit Glamorgan →

Best Places to Visit in Glamorgan in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Glamorgan.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Glamorgan

What is the weather like in December for some of the most popular destinations in Glamorgan, the United Kingdom?

Temperature range in Glamorgan (December)

Precipitation variation in Glamorgan (December)

Cardiff

In December Cardiff generally has low temperatures with maximum daytime temperatures around 10°C (50°F), minimum nighttime temperatures around 5°C (41°F) and high monthly rainfall. So on average the conditions are poor that month.

« November
December
January »
November
December
January
Max temperature
12°C (54°F)
10°C (50°F)
9°C (48°F)
Min temperature
7°C (45°F)
5°C (41°F)
4°C (39°F)
Monthly sun hours
66 hours
49 hours
53 hours
Monthly rainfall
117 mm (4.6 in)
119 mm (4.7 in)
105 mm (4.1 in)
Monthly rainy days
19 days
19 days
20 days
Weather conditions
poor
poor
poor
Climate in Cardiff →

Merthyr Tydfil

In December Merthyr Tydfil generally has low temperatures with maximum daytime temperatures around 8°C (46°F), minimum nighttime temperatures around 2°C (36°F) and high monthly rainfall. So on average the conditions are poor that month.

« November
December
January »
November
December
January
Max temperature
11°C (52°F)
8°C (46°F)
8°C (46°F)
Min temperature
4°C (39°F)
2°C (36°F)
2°C (36°F)
Monthly sun hours
66 hours
49 hours
53 hours
Monthly rainfall
115 mm (4.5 in)
122 mm (4.8 in)
114 mm (4.5 in)
Monthly rainy days
20 days
20 days
21 days
Weather conditions
poor
poor
poor
Climate in Merthyr Tydfil →

Bridgend

In December Bridgend generally has low temperatures with maximum daytime temperatures around 10°C (50°F), minimum nighttime temperatures around 5°C (41°F) and high monthly rainfall. So on average the conditions are poor that month.

« November
December
January »
November
December
January
Max temperature
12°C (54°F)
10°C (50°F)
9°C (48°F)
Min temperature
7°C (45°F)
5°C (41°F)
4°C (39°F)
Monthly sun hours
66 hours
49 hours
53 hours
Monthly rainfall
124 mm (4.9 in)
130 mm (5.1 in)
117 mm (4.6 in)
Monthly rainy days
20 days
20 days
21 days
Weather conditions
poor
poor
poor
Climate in Bridgend →

The Mumbles

In December The Mumbles generally has low temperatures with maximum daytime temperatures around 10°C (50°F), minimum nighttime temperatures around 5°C (41°F) and high monthly rainfall. So on average the conditions are poor that month.

« November
December
January »
November
December
January
Max temperature
12°C (54°F)
10°C (50°F)
9°C (48°F)
Min temperature
8°C (46°F)
5°C (41°F)
5°C (41°F)
Monthly sun hours
66 hours
49 hours
53 hours
Monthly rainfall
147 mm (5.8 in)
150 mm (5.9 in)
135 mm (5.3 in)
Monthly rainy days
20 days
20 days
20 days
Weather conditions
poor
poor
poor
Climate in The Mumbles →

Barry

In December Barry generally has low temperatures with maximum daytime temperatures around 10°C (50°F), minimum nighttime temperatures around 5°C (41°F) and high monthly rainfall. So on average the conditions are poor that month.

« November
December
January »
November
December
January
Max temperature
12°C (54°F)
10°C (50°F)
9°C (48°F)
Min temperature
7°C (45°F)
5°C (41°F)
4°C (39°F)
Monthly sun hours
66 hours
49 hours
53 hours
Monthly rainfall
113 mm (4.4 in)
115 mm (4.5 in)
102 mm (4 in)
Monthly rainy days
18 days
19 days
20 days
Weather conditions
poor
poor
poor
Climate in Barry →

Is your destination not in the list? Have a look at all destinations in Glamorgan, in the United Kingdom.

In our records: the United Kingdom December extremes

Notable December records observed across cities in the United Kingdom in our climate database (1976 – 2026). Historic readings can vary in quality, so treat these as illustrative.

  • In our records, the coldest December daytime high in the United Kingdom was -10°C (14°F) in Glasgow on December 29, 1995.
  • From our sources, the wettest December day in the United Kingdom brought 301 mm (12 in) in Belfast on December 4, 1982.

Popular cities in December

Day & night temperatures, rainfall and average weather in Glamorgan in December.

City Weather Day temp Night temp Rainfall
Cardiff 10°C (50°F) 5°C (41°F) 119 mm (4.7 in)
Merthyr Tydfil 8°C (46°F) 2°C (36°F) 122 mm (4.8 in)
Bridgend 10°C (50°F) 5°C (41°F) 130 mm (5.1 in)
The Mumbles 10°C (50°F) 5°C (41°F) 150 mm (5.9 in)
Barry 10°C (50°F) 5°C (41°F) 115 mm (4.5 in)
Cowbridge 10°C (50°F) 5°C (41°F) 124 mm (4.9 in)

Glamorgan weather in December: frequently asked questions

What is the weather like in Glamorgan, the United Kingdom in December?

Glamorgan, the United Kingdom typically experiences poor weather in December, part of the winter season. Daytime highs in Cardiff average around 10°C (50°F), and temperatures drop to about 5°C (41°F) at night.

What is the average temperature in Glamorgan, the United Kingdom in December?

Daytime temperatures in Cardiff peak at roughly 10°C (50°F) in December, dropping to about 5°C (41°F) overnight.

Does Glamorgan, the United Kingdom get a lot of rain in December?

Glamorgan, the United Kingdom sees substantial rainfall in December. Cardiff typically averages about 119 mm (4.7 in), a mix of wet and dry days, but bring an umbrella.

Is December a Good Time to Visit Glamorgan, the United Kingdom?

Given the typically poor weather conditions in Cardiff, December may not be the ideal time to visit Glamorgan, the United Kingdom.

Generally speaking, the best visiting conditions can be found in July and August offering mostly perfect weather in Cardiff. On the other hand, the months of January, February, November and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Glamorgan.

Weather and climate has detailed information for every country in the world. Are you going to the United Kingdom? Get detailed historical weather averages for many cities in the United Kingdom.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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