In February, the weather in Merthyr Tydfil is typically cold. Average daily high temperature in February is about 5 degrees above zero. On average, Merthyr Tydfil has 20 rainy, 6 cloudy, and 3 sunny days in February. The rains are usually heavy. February as well as January, March, April, and May is considered the most uncomfortable time to visit Merthyr Tydfil.