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
15°C
°C
°F
Condition: Overcast
Pressure: 1,010 hPa
Feel like: 16 °C
Temperature: 15°C
Cloud: 80%
Humidity: 95%
Wind: NW - 3 km/h
Visibility: 9.4 km
Wed
23 Sep
5°C / 14°C
Overcast
Thu
24 Sep
10°C / 14°C
Moderate Drizzle
Fri
25 Sep
9°C / 15°C
Overcast
Sat
26 Sep
10°C / 17°C
Overcast
Sun
27 Sep
9°C / 16°C
Overcast
Hourly forecast today:
00:00 AM
14° / 15°
14° / 15°
Overcast
95%
8 km/h
01:00 AM
14° / 15°
14° / 15°
Partly Cloudy
96%
6 km/h
02:00 AM
14° / 14°
14° / 14°
Partly Cloudy
95%
11 km/h
03:00 AM
13° / 13°
13° / 13°
Mainly Clear
96%
8 km/h
04:00 AM
12° / 12°
12° / 12°
Clear Sky
97%
6 km/h
05:00 AM
12° / 13°
12° / 13°
Mainly Clear
95%
8 km/h
06:00 AM
11° / 12°
11° / 12°
Clear Sky
95%
8 km/h
07:00 AM
11° / 13°
11° / 13°
Clear Sky
90%
6 km/h
08:00 AM
12° / 14°
12° / 14°
Clear Sky
85%
4 km/h
09:00 AM
12° / 15°
12° / 15°
Partly Cloudy
80%
5 km/h
10:00 AM
13° / 17°
13° / 17°
Partly Cloudy
76%
10 km/h
30 Day Averages and Extremes
- Average high 16.0°C
- Average low 10.73°C
- Hottest day 20°C (13 September 2026)
- Coldest day 0°C (04 October 2026)
- Average humidity 78.77%
- Days with precipitation 26 days
- Highest precipitation 94 mm (12 September 2026)
Yesterday's Data
- Max: 20°C
- Min: 12°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 mild weather in Merthyr Tydfil, with temperatures between 13ºC to 16ºC (55.4ºF to 60.8ºF), consider wearing:
- Light jacket (for cooler periods)
- Long-sleeve shirt or blouse
- Lightweight sweater or cardigan
- Cotton socks
Temperature
Early
13°C / 13°C
Morning
12°C / 15°C
Afternoon
13°C / 20°C
Evening
14°C / 17°C
Air quality
Good
Satisfactory air quality, minimal pollution, low risk
- CO2 446
- CO 154
- NH3 0
- NO2 12
- O3 34
- PM10 7
- PM25 5
- SO2 0
- CH4 1,468
Sunrise / Sunset
06:01
18:09