Other facts from our historical weather data: Which months have the greatest rainfall in Morfa Nefyn? Most rainfall (rainy season) is seen in January, October, November and December. Which is the warmest month in Morfa Nefyn? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Morfa Nefyn? The coldest month is February with an average maximum temperature of 9°C (48°F). Which is the wettest month in Morfa Nefyn? November tops the wettest month list with 203mm (8 in) of rainfall. Which is the driest month in Morfa Nefyn? May is the driest month with 87mm (3.4 in) of precipitation. Which is the sunniest month in Morfa Nefyn? May is the sunniest month with an average of 169 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.