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
10°C
°C
°F
Condition: Overcast
Pressure: 1,004 hPa
Feel like: 9 °C
Temperature: 10°C
Cloud: 100%
Humidity: 75%
Wind: E - 6 km/h
Visibility: 26.24 km
Fri
25 Sep
9°C / 17°C
Overcast
Sat
26 Sep
11°C / 17°C
Slight Rain
Sun
27 Sep
5°C / 15°C
Slight Rain
Mon
28 Sep
12°C / 20°C
Moderate Rain
Tue
29 Sep
14°C / 18°C
Moderate Rain
Hourly forecast today:
03:00 AM
6° / 10°
6° / 10°
Overcast
75%
16 km/h
04:00 AM
7° / 10°
7° / 10°
Overcast
79%
14 km/h
05:00 AM
7° / 9°
7° / 9°
Overcast
86%
6 km/h
06:00 AM
7° / 9°
7° / 9°
Partly Cloudy
85%
9 km/h
07:00 AM
7° / 10°
7° / 10°
Clear Sky
83%
7 km/h
08:00 AM
8° / 11°
8° / 11°
Mainly Clear
77%
9 km/h
09:00 AM
9° / 13°
9° / 13°
Overcast
75%
17 km/h
10:00 AM
10° / 14°
10° / 14°
Clear Sky
73%
20 km/h
11:00 AM
10° / 16°
10° / 16°
Overcast
70%
23 km/h
12:00 PM
11° / 17°
11° / 17°
Mainly Clear
67%
22 km/h
13:00 PM
11° / 18°
11° / 18°
Overcast
63%
22 km/h
30 Day Averages and Extremes
- Average high 15.73°C
- Average low 10.43°C
- Hottest day 20°C (13 September 2026)
- Coldest day 0°C (07 October 2026)
- Average humidity 80.7%
- Days with precipitation 26 days
- Highest precipitation 94 mm (12 September 2026)
Yesterday's Data
- Max: 19°C
- Min: 9°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 15ºC to 18ºC (59.0ºF to 64.4ºF), consider wearing:
- Cotton socks
- Long-sleeve shirt or blouse
- Lightweight sweater or cardigan
- Sun hat (if spending time outdoors)
Temperature
Early
6°C / 10°C
Morning
9°C / 13°C
Afternoon
12°C / 19°C
Evening
13°C / 15°C
Air quality
Good
Satisfactory air quality, minimal pollution, low risk
- CO2 437
- CO 193
- NH3 1
- NO2 3
- O3 52
- PM10 7
- PM25 3
- SO2 0
- CH4 1,446
Sunrise / Sunset
06:04
18:05