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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January, the same as December, in Merthyr Tydfil, United Kingdom, is another chilly winter month, with an average temperature fluctuating between 2.1°C (35.8°F) and 6.2°C (43.2°F). January is the coldest month, with the temperature often reaching an average high of 6.2°C (43.2°F) and an average low of 2.1°C (35.8°F). Weather in January »
Weather in February
The last month of the winter, February, is another chilly month in Merthyr Tydfil, United Kingdom, with an average temperature fluctuating between 6.6°C (43.9°F) and 2°C (35.6°F). As February takes its course, Merthyr Tydfil's average high-temperature registers at a still frosty 6.6°C (43.9°F), closely aligning with the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is still a chilly month in Merthyr Tydfil, United Kingdom, with an average temperature fluctuating between 8.8°C (47.8°F) and 2.6°C (36.7°F). Transitioning from February to March, Merthyr Tydfil observes an average high-temperature of a still chilly 8.8°C (47.8°F), differing subtly from the previous month. Weather in March »
Weather in April
April is a cool spring month in Merthyr Tydfil, United Kingdom, with an average temperature ranging between max 11.7°C (53.1°F) and min 4.3°C (39.7°F). Merthyr Tydfil ushers in April with an average high-temperature of a fresh 11.7°C (53.1°F), showing a close resemblance to the previous month. Weather in April »
Weather in May
May, the last month of the spring in Merthyr Tydfil, is a moderate month, with an average temperature ranging between max 14.2°C (57.6°F) and min 6.7°C (44.1°F). As Merthyr Tydfil, United Kingdom, steps into May, the average high-temperature is measured at a refreshing 14.2°C (57.6°F), displaying minor differences from April's 11.7°C (53.1°F). Weather in May »
Weather in June
The first month of the summer, June, is a comfortable month in Merthyr Tydfil, United Kingdom, with temperature in the range of an average high of 16.7°C (62.1°F) and an average low of 9.4°C (48.9°F). The average high-temperature for June is an enjoyable 16.7°C (62.1°F), closely aligning with the temperature of the preceding month. Weather in June »
Weather in July
July, the same as June, is another refreshing summer month in Merthyr Tydfil, United Kingdom, with an average temperature varying between 11.3°C (52.3°F) and 18.3°C (64.9°F). In Merthyr Tydfil, the average temperatures in July are the highest, with a peak at 18.3°C (64.9°F) and a low of 11.3°C (52.3°F). Weather in July »
Weather in August
August, the last month of the summer in Merthyr Tydfil, is another comfortable month, with an average temperature fluctuating between 11.3°C (52.3°F) and 17.7°C (63.9°F). Merthyr Tydfil records an average high-temperature of a still refreshing 17.7°C (63.9°F) as August arrives, nearly mirroring the previous month's climate. Weather in August »
Weather in September
September, the first month of the autumn in Merthyr Tydfil, is still a comfortable month, with an average temperature fluctuating between 9.5°C (49.1°F) and 16.1°C (61°F). The arrival of September sees a recorded average high-temperature of a still refreshing 16.1°C (61°F), showing little divergence from the previous month's conditions. Weather in September »
Weather in October
October, like September, is a moderate autumn month in Merthyr Tydfil, United Kingdom, with an average temperature fluctuating between 7.7°C (45.9°F) and 13.1°C (55.6°F). The move into October indicates a slight reduction in the average high-temperature, down from September's comfortable 16.1°C (61°F) to a moderate 13.1°C (55.6°F). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Merthyr Tydfil, United Kingdom, with an average temperature ranging between min 5°C (41°F) and max 9.1°C (48.4°F). The arrival of November corresponds with a minor reduction in the average high-temperature, down from October's mild 13.1°C (55.6°F) to a chilly 9.1°C (48.4°F). Weather in November »
Weather in December
The first month of the winter, December, is also a frosty month in Merthyr Tydfil, United Kingdom, with temperature in the range of an average low of 3.4°C (38.1°F) and an average high of 7°C (44.6°F). As November transitions into December, Merthyr Tydfil records an average high-temperature of a still chilly 7°C (44.6°F), showing a gentle shift from 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
What time of the year is the coldest in Merthyr Tydfil?
January tends to be the coldest month, with temperatures averaging a daily high of 6.2°C (43.2°F) and a low of 2.1°C (35.8°F).
How much does it rain in Merthyr Tydfil?
Throughout the year, in Merthyr Tydfil, there are 186.1 rainfall days, and 566mm (22.28") of precipitation is accumulated.
When does it snow in Merthyr Tydfil?
Months with snowfall are January through May, November and December.
When does it snow the most in Merthyr Tydfil?
The month with the most snowfall is January, when snow falls for 4.3 days and typically aggregates up to 32mm (1.26") of snow.
How much does it snow in Merthyr Tydfil?
Throughout the year, in Merthyr Tydfil, there are 13.6 snowfall days, and 134mm (5.28") of snow is accumulated.
What are the months with the lowest UV index in Merthyr Tydfil?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
What is the least humid month in Merthyr Tydfil?
The least humid month in Merthyr Tydfil is April, with an average relative humidity of 83%.
What is the driest month in Merthyr Tydfil?
May and September are months with the least rain in Merthyr Tydfil when the rain falls for 15.3 days and typically aggregates up to 32mm (1.26") of rain.
What is the month with the most sunshine in Merthyr Tydfil?
The months with the most sunshine are May and July, with an average of 7.3h of sunshine.
What is the month with the highest UV index in Merthyr Tydfil?
May through August, with an average maximum UV index of 4, are months with the highest UV index in Merthyr Tydfil.
When it does not snow in Merthyr Tydfil?
June through October are months without snowfall.
When are the longest days in Merthyr Tydfil?
June has the longest days of the year in Merthyr Tydfil, with an average of 16h and 36min of daylight.
What is the warmest month in Merthyr Tydfil?
July is the warmest month of the year in Merthyr Tydfil, United Kingdom, registering average temperatures as high as 18.3°C (64.9°F) and as low as 11.3°C (52.3°F).
When is Daylight Saving Time (DST) in Merthyr Tydfil?
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends, 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.
What is the most humid month in Merthyr Tydfil?
November and December, with an average relative humidity of 90%, are most humid months.
What is the wettest month in Merthyr Tydfil?
The month with the most rainfall in Merthyr Tydfil is November, when the rain falls for 18.7 days and typically aggregates up to 74mm (2.91") of precipitation.
What is the month with the least sunshine in Merthyr Tydfil?
The month with the least sunshine in Merthyr Tydfil is November, with an average of 3.4h of sunshine.
What is the month with the shortest days in Merthyr Tydfil?
December has the shortest days of the year in Merthyr Tydfil, United Kingdom, with an average of 7h and 54min of daylight.
Average temperature
Merthyr Tydfil, United Kingdom
The warmest month (with the highest average high temperature) is July (18.3°C).
The month with the lowest average high temperature is January (6.2°C).
The months with the highest average low temperature are July and August (11.3°C).
The coldest month (with the lowest average low temperature) is February (2°C).
Average pressure
Merthyr Tydfil, United Kingdom
- Average pressure in January:
1013.7mbar - Average pressure in February:
1013.2mbar - Average pressure in March:
1015.2mbar - Average pressure in April:
1015.3mbar - 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:
1014.4mbar - Average pressure in November:
1009.8mbar - Average pressure in December:
1013.7mbar
The months with the highest atmospheric pressure are May and September (1016.6mbar).
The month with the lowest atmospheric pressure is November (1009.8mbar).
Average wind speed
Merthyr Tydfil, United Kingdom
- Average wind speed in January:
19.4km/h - Average wind speed in February:
20.3km/h - Average wind speed in March:
18.1km/h - Average wind speed in April:
14.8km/h - Average wind speed in May:
14.6km/h - Average wind speed in June:
13.7km/h
- Average wind speed in July:
13.8km/h - Average wind speed in August:
14.5km/h - Average wind speed in September:
14.5km/h - Average wind speed in October:
16.4km/h - Average wind speed in November:
18.2km/h - Average wind speed in December:
19.8km/h
The windiest month (with the highest average wind speed) is February (20.3km/h).
The calmest month (with the lowest average wind speed) is June (13.7km/h).
Average humidity
Merthyr Tydfil, United Kingdom
The months with the highest relative humidity are November and December (90%).
The month with the lowest relative humidity is April (83%).
Average rainfall
Merthyr Tydfil, United Kingdom
The wettest month (with the highest rainfall) is November (74mm).
The driest months (with the least rainfall) are May and September (32mm).
Average rainfall days
Merthyr Tydfil, United Kingdom
- Average rainfall days in January:
15.7 days - Average rainfall days in February:
12.8 days - Average rainfall days in March:
13.5 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
16.3 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
16.4 days - Average rainfall days in September:
12.7 days - Average rainfall days in October:
15.9 days - Average rainfall days in November:
18.7 days - Average rainfall days in December:
16.5 days
The month with the highest number of rainy days is November (18.7 days).
The month with the least rainy days is September (12.7 days).
Average snowfall
Merthyr Tydfil, United Kingdom
The month with the highest snowfall is January (32mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days
Merthyr Tydfil, United Kingdom
- Average snowfall days in January:
4.3 days - Average snowfall days in February:
3.6 days - Average snowfall days in March:
1.8 days - Average snowfall days in April:
0.4 days - Average snowfall days in May:
0.2 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:
0.8 days - Average snowfall days in December:
2.5 days
The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight / Average sunshine
Merthyr Tydfil, United Kingdom
- Average daylight in January:
8h and 2min - Average daylight in February:
10h and 0min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 4min - Average daylight in June:
16h and 4min
- Average daylight in July:
16h and 1min - Average daylight in August:
14h and 4min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
8h and 5min - Average daylight in December:
7h and 5min
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 3min - Average sunshine in February:
3h and 3min - Average sunshine in March:
5h and 2min - Average sunshine in April:
7h and 1min - Average sunshine in May:
7h and 2min - Average sunshine in June:
7h and 0min
- Average sunshine in July:
7h and 2min - Average sunshine in August:
6h and 4min - Average sunshine in September:
6h and 2min - Average sunshine in October:
4h and 0min - Average sunshine in November:
3h and 2min - Average sunshine in December:
3h and 4min
The months with the most sunshine are May and July (Average sunshine: 7h and 18min).
The month with the least sunshine is November (Average sunshine: 3h and 24min).
Average sunshine days
Merthyr Tydfil, United Kingdom
- Average sunshine days in January:
10.2 days - Average sunshine days in February:
10.7 days - Average sunshine days in March:
13.6 days - Average sunshine days in April:
13 days - Average sunshine days in May:
13.2 days - Average sunshine days in June:
10.2 days
- Average sunshine days in July:
9.5 days - Average sunshine days in August:
10.8 days - Average sunshine days in September:
13.8 days - Average sunshine days in October:
11.8 days - Average sunshine days in November:
8.2 days - Average sunshine days in December:
9.6 days
The month with the most sunshine days is September (13.8 days).
The month with the least sunshine days is November (8.2 days).
Average UV index
Merthyr Tydfil, United Kingdom
The months with the highest UV index are May, June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Merthyr Tydfil, United Kingdom
The month with the most cloud cover is November (Cloud cover 67).
The month with the least cloud cover is April (Cloud cover 52).
Average visibility
Merthyr Tydfil, United Kingdom
The months with the highest visibility are January, February, March, April, May, June and December (9km).
The months with the lowest visibility are July, August, September, October and November (8km).
