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: 1,000 hPa
Feel like: 23 °C
Temperature: 20°C
Cloud: 5%
Humidity: 84%
Wind: E - 3 km/h
Visibility: 19.62 km
Wed
24 Jun
21°C / 33°C
Slight Thunderstorm
Thu
25 Jun
19°C / 26°C
Overcast
Fri
26 Jun
17°C / 22°C
Drizzle
Sat
27 Jun
13°C / 18°C
Moderate Drizzle
Sun
28 Jun
12°C / 18°C
Drizzle
Hourly forecast today:
05:00 AM
17° / 20°
17° / 20°
Clear Sky
84%
10 km/h
06:00 AM
18° / 22°
18° / 22°
Clear Sky
80%
7 km/h
07:00 AM
18° / 23°
18° / 23°
Clear Sky
77%
11 km/h
08:00 AM
19° / 24°
19° / 24°
Clear Sky
73%
16 km/h
09:00 AM
19° / 25°
19° / 25°
Clear Sky
71%
20 km/h
10:00 AM
19° / 26°
19° / 26°
Clear Sky
67%
23 km/h
11:00 AM
19° / 27°
19° / 27°
Clear Sky
63%
26 km/h
12:00 PM
19° / 28°
19° / 28°
Clear Sky
61%
28 km/h
13:00 PM
19° / 28°
19° / 28°
Clear Sky
57%
29 km/h
14:00 PM
19° / 29°
19° / 29°
Clear Sky
55%
22 km/h
15:00 PM
19° / 30°
19° / 30°
Clear Sky
53%
22 km/h
30 Day Averages and Extremes
- Average high 19.9°C
- Average low 12.8°C
- Hottest day 33°C (23 June 2026)
- Coldest day 0°C (06 July 2026)
- Average humidity 71.37%
- Days with precipitation 23 days
- Highest precipitation 89 mm (16 June 2026)
Yesterday's Data
- Max: 30°C
- Min: 19°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 33ºC (91.4ºF), consider wearing:
- UV-blocking sunglasses
- Lightweight, loose-fitting shorts
- High SPF sunscreen for outdoor activities
- Airy sandals or flip-flops
Temperature
Early
17°C / 20°C
Morning
19°C / 25°C
Afternoon
19°C / 30°C
Evening
21°C / 24°C
Air quality
Good
Satisfactory air quality, minimal pollution, low risk
- CO2 442
- CO 132
- NH3 1
- NO2 6
- O3 65
- PM10 21
- PM25 13
- SO2 0
- CH4 1,453
Sunrise / Sunset
03:56
20:36