Other facts from our historical weather data: Which months have the greatest rainfall in Kaji-Say? Most rainfall (rainy season) is seen in June, July, August and September. When is winter in Kaji-Say? The coldest season / winter is in the following months: January, February, March and December. Which is the warmest month in Kaji-Say? 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 Kaji-Say? The coldest month is January with an average maximum temperature of -3°C (27°F). Which is the wettest month in Kaji-Say? August tops the wettest month list with 166mm (6.5 in) of rainfall. Which is the driest month in Kaji-Say? January is the driest month with 39mm (1.5 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.