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:
Clear Sky
22°C
°C
°F
Condition: Clear Sky
Pressure: 1,005 hPa
Feel like: 21 °C
Temperature: 22°C
Cloud: 13%
Humidity: 46%
Wind: WNW - 11 km/h
Visibility: 32.64 km
Tue
21 Jul
11°C / 23°C
Overcast
Wed
22 Jul
11°C / 24°C
Overcast
Thu
23 Jul
11°C / 24°C
Partly Cloudy
Fri
24 Jul
10°C / 21°C
Drizzle
Sat
25 Jul
15°C / 20°C
Drizzle
Hourly forecast today:
17:00 PM
10° / 22°
10° / 22°
Clear Sky
46%
26 km/h
18:00 PM
10° / 22°
10° / 22°
Clear Sky
49%
32 km/h
19:00 PM
10° / 20°
10° / 20°
Clear Sky
53%
25 km/h
20:00 PM
10° / 18°
10° / 18°
Clear Sky
60%
20 km/h
21:00 PM
11° / 17°
11° / 17°
Clear Sky
66%
19 km/h
22:00 PM
11° / 17°
11° / 17°
Mainly Clear
70%
13 km/h
23:00 PM
11° / 17°
11° / 17°
Partly Cloudy
70%
21 km/h
00:00 AM
11° / 16°
11° / 16°
Clear Sky
72%
24 km/h
01:00 AM
11° / 16°
11° / 16°
Clear Sky
72%
25 km/h
02:00 AM
9° / 16°
9° / 16°
Mainly Clear
67%
21 km/h
03:00 AM
10° / 15°
10° / 15°
Mainly Clear
72%
14 km/h
30 Day Averages and Extremes
- Average high 21.9°C
- Average low 12.73°C
- Hottest day 31°C (09 July 2026)
- Coldest day 0°C (02 August 2026)
- Average humidity 61.4%
- Days with precipitation 12 days
- Highest precipitation 36 mm (28 July 2026)
Yesterday's Data
- Max: 24°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 warm weather in Merthyr Tydfil, with temperatures between 21ºC to 24ºC (69.8ºF to 75.2ºF), you might consider wearing:
- Cotton or linen fabrics
- T-shirt or short-sleeve blouse
- Light, breathable socks
- Comfortable sandals or sneakers
Temperature
Early
9°C / 12°C
Morning
6°C / 19°C
Afternoon
8°C / 24°C
Evening
11°C / 17°C
Air quality
Good
Satisfactory air quality, minimal pollution, low risk
- CO2 429
- CO 108
- NH3 1
- NO2 1
- O3 71
- PM10 5
- PM25 3
- SO2 0
- CH4 1,376
Sunrise / Sunset
04:21
20:19