Merthyr Tydfil, United Kingdom Weather

  1. Merthyr Tydfil, United Kingdom Weather
  2. Current conditions
  3. Weather forecast
  4. Averages and extremes
  5. Yesterday's Data
  6. Temperature and possibility of rain in Merthyr Tydfil over the next 12 hours
  7. Temperature and possibility of rain in Merthyr Tydfil in the coming days
  8. Rainfall in Merthyr Tydfil in the coming days
  9. Merthyr Tydfil Weather Summary
  10. Weather averages by month
  11. Merthyr Tydfil's weather
  12. Frequently asked questions
  13. Comments
Merthyr Tydfil, Weather
(Photo by Viktor Forgacs on Unsplash)

Current conditions

Updated:
10°C
50.0°F
°C °F

Condition: Overcast

Pressure: 980 hPa

Feel like: 6 °C

Temperature: 10°C

Cloud: 100%

Humidity: 81%

Wind: WSW - 22 km/h

Visibility: 18.0 km

Weather forecast

Wed
10 Dec
7°C / 10°C
Drizzle Dense Intensity
Thu
11 Dec
6°C / 9°C
Slight Rain
Fri
12 Dec
5°C / 9°C
Slight Rain
Sat
13 Dec
6°C / 10°C
Slight Rain
Sun
14 Dec
10°C / 11°C
Moderate Rain
Hourly forecast today:
20:00 PM
7° / 10°
7° / 10°
Overcast
81% 55 km/h
21:00 PM
6° / 10°
6° / 10°
Overcast
77% 49 km/h
22:00 PM
6° / 10°
6° / 10°
Partly Cloudy
78% 43 km/h
23:00 PM
7° / 9°
7° / 9°
Overcast
82% 36 km/h
00:00 AM
7° / 10°
7° / 10°
Overcast
81% 41 km/h
01:00 AM
8° / 9°
8° / 9°
Drizzle
90% 41 km/h
02:00 AM
7° / 9°
7° / 9°
Overcast
86% 37 km/h
03:00 AM
7° / 9°
7° / 9°
Overcast
89% 39 km/h
04:00 AM
8° / 9°
8° / 9°
Overcast
90% 39 km/h
05:00 AM
7° / 9°
7° / 9°
Moderate Drizzle
90% 50 km/h
06:00 AM
7° / 9°
7° / 9°
Overcast
86% 43 km/h

30 Day Averages and Extremes

  • Average high 9.03°C
  • Average low 5.13°C
  • Hottest day 13°C (09 December 2025)
  • Coldest day 0°C (26 November 2025)
  • Average humidity 91.53%
  • Days with precipitation 29 days
  • Highest precipitation 100 mm (01 December 2025)

Yesterday's Data

  • Max: 11°C
  • Min: 9°C
  • Total Precipitation: 4 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

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 cool weather in Merthyr Tydfil, with temperatures between 10ºC to 13ºC (50.0ºF to 55.4ºF), you should consider wearing:
- Light scarf or wrap
- Casual shoes or sneakers
- Cotton socks
- Knit hat (optional for cooler mornings)

Temperature

Early
11°C / 11°C
Morning
12°C / 12°C
Afternoon
12°C / 12°C
Evening
6°C / 10°C

Air quality

Good

Satisfactory air quality, minimal pollution, low risk

  • CO2 443
  • CO 146
  • NH3 0
  • NO2 3
  • O3 77
  • PM10 14
  • PM25 4
  • SO2 0
  • CH4 1,382

Sunrise / Sunset

08:08
16:03