Jundiai's climate is mild and temperate, with a distinct seasonal pattern. In the summer months of September to November, temperatures rise significantly, often reaching highs above 30°C. The winter months, June to August, are cool, with temperatures rarely exceeding 20°C. Spring (April to May) and autumn (September to November) bring mild temperatures, while the cooler winter months have a slight chill in the air, especially at night. Overall, temperature fluctuations throughout the year remain relatively moderate.