Weather is probably a major factor when you plan your trip to Jundiai, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and December, with an average temperature of 22°C, while the coldest months are July and June, with an average of 18°C. The rainiest months in Jundiai are January, December, February and November, with each month seeing an average of 210 mm of rainfall.