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:
9°C
48.2°F
°C °F

Condition: Clear Sky

Pressure: 1,005 hPa

Feel like: 8 °C

Temperature: 9°C

Cloud: 0%

Humidity: 81%

Wind: NNE - 4 km/h

Visibility: 36.14 km

Weather forecast

Fri
25 Sep
10°C / 15°C
Drizzle
Sat
26 Sep
11°C / 16°C
Moderate Drizzle
Sun
27 Sep
8°C / 14°C
Drizzle
Mon
28 Sep
11°C / 17°C
Slight Rain Showers
Tue
29 Sep
12°C / 16°C
Moderate Drizzle
Hourly forecast today:
00:00 AM
6° / 9°
6° / 9°
Clear Sky
81% 14 km/h
01:00 AM
6° / 9°
6° / 9°
Clear Sky
83% 11 km/h
02:00 AM
6° / 9°
6° / 9°
Partly Cloudy
79% 10 km/h
03:00 AM
6° / 8°
6° / 8°
Clear Sky
86% 9 km/h
04:00 AM
6° / 9°
6° / 9°
Clear Sky
83% 14 km/h
05:00 AM
7° / 8°
7° / 8°
Clear Sky
89% 11 km/h
06:00 AM
7° / 8°
7° / 8°
Clear Sky
91% 12 km/h
07:00 AM
8° / 9°
8° / 9°
Partly Cloudy
91% 10 km/h
08:00 AM
9° / 11°
9° / 11°
Overcast
86% 6 km/h
09:00 AM
10° / 13°
10° / 13°
Overcast
82% 19 km/h
10:00 AM
11° / 14°
11° / 14°
Overcast
81% 24 km/h

30 Day Averages and Extremes

  • Average high 15.43°C
  • Average low 10.4°C
  • Hottest day 20°C (13 September 2026)
  • Coldest day 0°C (06 October 2026)
  • Average humidity 81.5%
  • Days with precipitation 26 days
  • Highest precipitation 94 mm (12 September 2026)

Yesterday's Data

  • Max: 19°C
  • Min: 8°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

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 12ºC to 15ºC (53.6ºF to 59.0ºF), consider wearing:
- Lightweight sweater or cardigan
- Cotton socks
- Long-sleeve shirt or blouse
- Comfortable jeans or slacks

Temperature

Early
6°C / 8°C
Morning
10°C / 13°C
Afternoon
13°C / 19°C
Evening
14°C / 15°C

Air quality

Good

Satisfactory air quality, minimal pollution, low risk

  • CO2 445
  • CO 189
  • NH3 1
  • NO2 2
  • O3 52
  • PM10 5
  • PM25 3
  • SO2 0
  • CH4 1,490

Sunrise / Sunset

06:04
18:05