Other facts from our historical weather data: Which months have the greatest rainfall in Sertar? Most rainfall (rainy season) is seen in June, July, August and September. Does Sertar have a dry season? Yes, the months of January and December are very dry. Which is the warmest month in Sertar? July has an average maximum temperature of 16°C (61°F) and is the warmest month of the year. Which is the coldest month in Sertar? The coldest month is January with an average maximum temperature of -7°C (19°F). Which is the wettest month in Sertar? June tops the wettest month list with 200mm (7.9 in) of rainfall. Which is the driest month in Sertar? January is the driest month with 14mm (0.6 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.