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
20°C
°C
°F
Condition: Clear Sky
Pressure: 997 hPa
Feel like: 24 °C
Temperature: 20°C
Cloud: 0%
Humidity: 95%
Wind: N - 2 km/h
Visibility: 10.8 km
Thu
25 Jun
17°C / 25°C
Overcast
Fri
26 Jun
15°C / 23°C
Overcast
Sat
27 Jun
13°C / 17°C
Moderate Drizzle
Sun
28 Jun
12°C / 18°C
Overcast
Mon
29 Jun
12°C / 16°C
Slight Rain Showers
Hourly forecast today:
03:00 AM
19° / 20°
19° / 20°
Clear Sky
95%
7 km/h
04:00 AM
19° / 20°
19° / 20°
Clear Sky
97%
9 km/h
05:00 AM
19° / 21°
19° / 21°
Overcast
90%
9 km/h
06:00 AM
20° / 22°
20° / 22°
Clear Sky
88%
6 km/h
07:00 AM
21° / 22°
21° / 22°
Clear Sky
90%
6 km/h
08:00 AM
19° / 25°
19° / 25°
Clear Sky
72%
14 km/h
09:00 AM
19° / 26°
19° / 26°
Clear Sky
65%
15 km/h
10:00 AM
18° / 27°
18° / 27°
Clear Sky
58%
13 km/h
11:00 AM
18° / 28°
18° / 28°
Clear Sky
53%
14 km/h
12:00 PM
18° / 29°
18° / 29°
Clear Sky
52%
19 km/h
13:00 PM
17° / 30°
17° / 30°
Clear Sky
47%
19 km/h
30 Day Averages and Extremes
- Average high 18.53°C
- Average low 12.37°C
- Hottest day 34°C (24 June 2026)
- Coldest day 0°C (07 July 2026)
- Average humidity 74.2%
- Days with precipitation 24 days
- Highest precipitation 89 mm (16 June 2026)
Yesterday's Data
- Max: 32°C
- Min: 20°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 very hot weather in Merthyr Tydfil, with the high temperatures above 34ºC (93.2ºF), consider wearing:
- Ultra-thin, breathable socks
- Airy sandals or flip-flops
- Light, natural fabrics (like cotton or linen)
- High SPF sunscreen for outdoor activities
Temperature
Early
19°C / 20°C
Morning
19°C / 26°C
Afternoon
16°C / 31°C
Evening
19°C / 25°C
Air quality
Moderate
Acceptable air quality, some pollutants present, minor health concerns for sensitive individuals
- CO2 456
- CO 159
- NH3 1
- NO2 3
- O3 68
- PM10 26
- PM25 17
- SO2 0
- CH4 1,573
Sunrise / Sunset
03:56
20:36