Weather in Merthyr in August

General weather information about Merthyr

Average annual temperature is 11.5 °C

Absolute maximum temperature: 27.5 °C

Absolute minimum temperature: -3.3 °C

Number of sunny days: 100 days

Number of rainy days: 265 days

Look at detailed online map of Merthyr

* Weather data for Merthyr United Kingdom is based on climate observations for 2026 year

Merthyr air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.313.813.016.321.327.423.623.027.518.914.212.8
Average daytime temperature (°C)8.49.59.712.417.121.618.218.519.914.810.810.2
Average temperature (°C)6.26.77.49.013.017.515.715.916.812.78.68.4
Average night temperature (°C)3.73.75.15.59.013.013.013.213.710.76.46.3
Absolute minimum temperature (°C)-1.7-1.5-0.21.56.28.69.79.76.15.3-2.1-3.3

Merthyr monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.010.012.014.016.016.016.015.013.011.09.08.0
Daylight mean duration (h)8.410.011.913.915.716.616.214.612.710.78.97.9
Daylight minimum duration (h)7.09.010.012.014.016.015.013.011.09.08.07.0
Sunshine mean duration (h)3.84.44.47.911.511.99.38.77.44.54.42.4
Precipitation (mm)15723269805763189144156168123249
Sunny days11174101813017694
Rainy days201127201317313023252127
Snow days000000000000

Merthyr - weather forecast by months

Merthyr weather in januaryMerthyr weather in februaryMerthyr weather in marchMerthyr weather in aprilMerthyr weather in mayMerthyr weather in juneMerthyr weather in julyMerthyr weather in augustMerthyr weather in septemberMerthyr weather in octoberMerthyr weather in novemberMerthyr weather in december

Best time to visit Merthyr:

The best time to visit Merthyr during the most sunny months:

  • May — 11.5(h)
  • June — 11.9(h)
  • July — 9.3(h)
  • August — 8.7(h)

Months with the longest average daylight duration in Merthyr:

  • May — 15.7(h)
  • June — 16.6(h)
  • July — 16.2(h)

The largest precipitation sum in Merthyr is at

  • March — 269(mm)
  • July — 189(mm)
  • December — 249(mm)

    • Weather forecast in the closest to Merthyr admin centers

    Weather forecast in the closest towns to Merthyr

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    Frequently asked questions

    When is the best time to visit Merthyr?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Merthyr.
    What is the weather like in Merthyr?
    See average temperature, rainfall and daylight hours for Merthyr by month in the table above.
    How many sunny days does Merthyr have?
    The monthly weather statistics above show sunshine and rainfall patterns for Merthyr throughout the year.