Other facts from our historical weather data: Does Sunan have a dry season? Yes, the months of January, February, November and December are very dry. Which is the warmest month in Sunan? July has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Sunan? The coldest month is January with an average maximum temperature of -7°C (19°F). Which is the wettest month in Sunan? July tops the wettest month list with 127mm (5 in) of rainfall. Which is the driest month in Sunan? December is the driest month with 7mm (0.3 in) of precipitation. 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.