September in Ibiza offers a transition from the peak summer heat to a milder, more comfortable climate. Average daytime temperatures typically range from the mid-70s to low 80s Fahrenheit (mid-20s to high 20s Celsius), with cooler evenings. Sea temperatures remain warm, generally in the low 70s Fahrenheit (low 20s Celsius), making swimming and water sports still enjoyable. Rainfall is relatively low, although slightly higher than in July and August.
This period offers an ideal balance for visitors. The slightly cooler temperatures are perfect for exploring the island, from its historic old town to its picturesque countryside, without the intense heat of the summer months. The sea remains inviting for swimming, and the beaches are less crowded. Historically, September has marked the close of the main tourist season, offering a more relaxed atmosphere while still providing access to open venues and activities. This combination of favorable weather and a less frenetic pace makes it attractive to many travelers.