September falls squarely within Costa Rica’s “green season,” also known as the rainy season. This period is characterized by lush landscapes, vibrant flora, and generally lower prices for accommodations and tours. While rainfall is frequent, it typically arrives in the afternoons or evenings, leaving mornings sunny and allowing ample time for outdoor activities. Travelers can anticipate average temperatures in the lowlands ranging from the mid-70s to the mid-80s Fahrenheit (mid-20s to high 20s Celsius), with cooler temperatures in higher elevations.
Understanding the climatic conditions prevalent during this specific month is vital for planning a successful trip. Packing appropriate attire, including rain gear and quick-drying clothing, is essential. The green season offers unique opportunities to observe wildlife and enjoy the tranquility of less crowded tourist destinations. Historically, September has offered a balance between occasional downpours and sunshine, presenting a cost-effective opportunity to experience Costa Rica’s natural beauty.