Merthyr Tydfil, United Kingdom Weather
- Merthyr Tydfil, United Kingdom Weather
- Current conditions
- Weather forecast
- Averages and extremes
- Yesterday's Data
- Temperature and possibility of rain in Merthyr Tydfil over the next 12 hours
- Temperature and possibility of rain in Merthyr Tydfil in the coming days
- Rainfall in Merthyr Tydfil in the coming days
- Merthyr Tydfil Weather Summary
- Weather averages by month
- Merthyr Tydfil's weather
- Frequently asked questions
- Comments
Current conditions
Updated:
Overcast
4°C
°C
°F
Condition: Overcast
Pressure: 989 hPa
Feel like: 0 °C
Temperature: 4°C
Cloud: 100%
Humidity: 92%
Wind: ENE - 16 km/h
Visibility: 4.32 km
Wed
11 Nov
6°C / 9°C
Moderate Drizzle
Thu
12 Nov
0°C / 6°C
Overcast
Fri
13 Nov
-1°C / 5°C
Overcast
Sat
14 Nov
-2°C / 6°C
Overcast
Sun
15 Nov
4°C / 13°C
Moderate Rain
Hourly forecast today:
03:00 AM
3° / 4°
3° / 4°
Overcast
92%
35 km/h
04:00 AM
3° / 4°
3° / 4°
Overcast
90%
33 km/h
05:00 AM
3° / 4°
3° / 4°
Overcast
92%
35 km/h
06:00 AM
3° / 4°
3° / 4°
Overcast
92%
33 km/h
07:00 AM
4° / 5°
4° / 5°
Overcast
93%
30 km/h
08:00 AM
4° / 5°
4° / 5°
Overcast
92%
27 km/h
09:00 AM
4° / 5°
4° / 5°
Overcast
89%
33 km/h
10:00 AM
4° / 6°
4° / 6°
Overcast
87%
37 km/h
11:00 AM
4° / 6°
4° / 6°
Overcast
84%
43 km/h
12:00 PM
4° / 6°
4° / 6°
Overcast
84%
33 km/h
13:00 PM
4° / 6°
4° / 6°
Drizzle
87%
32 km/h
30 Day Averages and Extremes
- Average high 8.97°C
- Average low 4.53°C
- Hottest day 14°C (27 October 2026)
- Coldest day -2°C (14 November 2026)
- Average humidity 82.03%
- Days with precipitation 18 days
- Highest precipitation 68 mm (27 October 2026)
Yesterday's Data
- Max: 6°C
- Min: 2°C
- Total Precipitation: 0 mm
Temperature and possibility of rain in Merthyr Tydfil over the next 12 hours
Temperature and possibility of rain in Merthyr Tydfil in the coming days
Rainfall in Merthyr Tydfil in the coming days
Merthyr Tydfil Climate Summary
Merthyr Tydfil features a Marine west coast, warm summer (Köppen classification: Cfb), with an average annual temperature of 10.04ºC (50.07ºF), which is about -0.71% lower than the national average for United Kingdom. Annually, the city experiences approximately 78.16 millimeters (3.08 inches) of rainfall, spread across 150.0 rainy days, accounting for 41.1% of the year.
| Longitude | 51.74873 |
| Latitude | -3.381646 |
| Yearly high temperature | 12.0ºC (53.6ºF) |
| Yearly low temperature | 6.39ºC (43.5ºF) |
| Hottest month | July 18.36ºC (65.05ºF) |
| Coldest month | December 3.47ºC (38.25ºF) |
| Yearly precip | 78.16mm (3.08in) |
| Days with rainfall | 150.0 days (41.1%) |
| Driest month | September (86.99%) |
| Wettest month | December (89.92%) |
Weather averages by month
| Month | High / Low (°C) | Rain |
|---|---|---|
| January | 6.06° / 2.22° | 13.82 days |
| February | 6.49° / 2.16° | 11.36 days |
| March | 8.68° / 2.8° | 10.91 days |
| April | 11.55° / 4.41° | 10.09 days |
| May | 14.05° / 6.85° | 11.82 days |
| June | 16.56° / 9.73° | 13.18 days |
| July | 18.36° / 11.43° | 12.55 days |
| August | 17.64° / 11.54° | 14.09 days |
| September | 15.96° / 9.6° | 10.27 days |
| October | 12.65° / 7.66° | 13.18 days |
| November | 8.9° / 4.86° | 14.18 days |
| December | 7.06° / 3.47° | 14.55 days |
Merthyr Tydfil's weather
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Frequently asked questions
1. What is the hottest month in Merthyr Tydfil?
July has the highest average monthly temperature (daily mean of 18.36ºC) and December are the coolest (daily mean of 3.47ºC).
2. What should I wear in Merthyr Tydfil today?
For today's cold weather in Merthyr Tydfil, with temperatures ranging from 4ºC to 7ºC (39.2ºF to 44.6ºF), you should wear:
- Hat and gloves, particularly for early mornings or evenings
- Wool or thermal socks
- Long pants (jeans or other thick materials)
- Layered clothing (such as a thermal shirt under a sweater)
Temperature
Early
3°C / 4°C
Morning
4°C / 5°C
Afternoon
5°C / 7°C
Evening
5°C / 7°C
Air quality
Moderate
Acceptable air quality, some pollutants present, minor health concerns for sensitive individuals
- CO2 455
- CO 187
- NH3 0
- NO2 7
- O3 47
- PM10 19
- PM25 17
- SO2 0
- CH4 1,467
Sunrise / Sunset
07:23
16:30