Jaen, Peru experiences mild temperatures year-round with minimal seasonal variation. The warmest months are March and April, with average highs around 23°C, while the coolest months are January and December, averaging 22°C. June is also relatively cool, but temperature increases in August to reach a peak of nearly 31°C. September is the hottest month on record, with temperatures often reaching 30°C. The temperature fluctuations are generally mild throughout the year, with no distinct seasonal extremes.