Barcelona in September typically offers a transition from summer heat to milder autumn conditions. Average temperatures generally range from highs in the mid-70s Fahrenheit (low 20s Celsius) to lows in the mid-60s Fahrenheit (high teens Celsius). Sea temperatures remain pleasant, often allowing for continued swimming. Rainfall is possible but generally less frequent and intense than in later autumn months.
Understanding typical climate conditions for this period is valuable for planning travel, events, and outdoor activities. Historical weather data provides insights into expected conditions and helps anticipate potential variations. This information empowers visitors to pack appropriately, schedule activities strategically, and make informed decisions about accommodations and transportation.