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:
Light Drizzle
15°C
°C
°F
Condition: Drizzle
Pressure: 994 hPa
Feel like: 15 °C
Temperature: 15°C
Cloud: 100%
Humidity: 97%
Wind: WSW - 10 km/h
Visibility: 11.12 km
Sun
21 Jun
15°C / 25°C
Drizzle
Mon
22 Jun
18°C / 29°C
Slight Thunderstorm
Tue
23 Jun
17°C / 30°C
Slight Thunderstorm
Wed
24 Jun
21°C / 31°C
Slight Thunderstorm
Thu
25 Jun
16°C / 28°C
Moderate Drizzle
Hourly forecast today:
04:00 AM
15° / 15°
15° / 15°
Drizzle
97%
20 km/h
05:00 AM
14° / 15°
14° / 15°
Overcast
96%
18 km/h
06:00 AM
14° / 15°
14° / 15°
Overcast
96%
19 km/h
07:00 AM
14° / 15°
14° / 15°
Overcast
91%
20 km/h
08:00 AM
14° / 15°
14° / 15°
Overcast
94%
14 km/h
09:00 AM
13° / 16°
13° / 16°
Overcast
83%
21 km/h
10:00 AM
13° / 17°
13° / 17°
Overcast
76%
22 km/h
11:00 AM
11° / 18°
11° / 18°
Overcast
66%
20 km/h
12:00 PM
10° / 19°
10° / 19°
Overcast
58%
19 km/h
13:00 PM
10° / 19°
10° / 19°
Overcast
55%
21 km/h
14:00 PM
10° / 20°
10° / 20°
Overcast
50%
20 km/h
30 Day Averages and Extremes
- Average high 18.33°C
- Average low 12.13°C
- Hottest day 31°C (24 June 2026)
- Coldest day 0°C (03 July 2026)
- Average humidity 76.03%
- Days with precipitation 23 days
- Highest precipitation 98 mm (05 June 2026)
Yesterday's Data
- Max: 21°C
- Min: 15°C
- Total Precipitation: 6 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:
- Shorts or lightweight trousers
- Sun hat or cap
- Sunscreen (if spending time outdoors)
- Light, breathable socks
Temperature
Early
15°C / 15°C
Morning
13°C / 16°C
Afternoon
9°C / 21°C
Evening
12°C / 16°C
Air quality
Good
Satisfactory air quality, minimal pollution, low risk
- CO2 447
- CO 118
- NH3 0
- NO2 5
- O3 38
- PM10 3
- PM25 2
- SO2 0
- CH4 1,365
Sunrise / Sunset
03:55
20:36