Bali weather in September 2026

September is Bali's shoulder season, caught between the dry spell and the monsoon build-up. Daytime highs hover around 19.8°C (67.6°F), while nights dip to 12.9°C (55.2°F)—cool by Balinese standards, especially in the highlands around Ubud. You'll get roughly 11 hours of sunshine daily, but don't let that fool you: 121.8mm of rain spreads across 21 days, usually arriving in late afternoon bursts. Mornings tend to be crisp and clear, the air still dusty from August's heat, then clouds roll in by 3pm. The humidity sits in that awkward middle ground—not as sticky as the wet season, but noticeably muggy compared to June and July.

The island feels noticeably quieter than peak season. Tourist numbers drop, restaurant tables open up, and rice terraces turn that luminous green as farmers plant the new crop. Prices on accommodation and tours soften considerably. Locals celebrate Kuningan in late September—a major Hindu festival with temple ceremonies and processions—so expect increased traffic around spiritual sites and villages, but it's a genuine cultural moment, not a manufactured tourist event. Beaches are less crowded, though the water temperature sits around 28°C (82°F), still warm enough for swimming despite the rain.

Over the past decade, September has remained consistently transitional. Climate records show rainfall has crept slightly higher in recent years, but 2026 aligns with the ten-year average. The cool temperatures are reliable; what shifts is the afternoon downpour timing—some years they're brief and predictable, others more scattered. Pack layers and expect some variability.

September suits budget travelers, solo explorers, and photographers who want dramatic skies without peak-season crowds. Families with school schedules should note that early September still catches some travelers mid-holiday, but by mid-month, prices genuinely drop. Hikers will appreciate the cooler mornings; swimmers shouldn't worry about the rain—it clears quickly. In 2026, book accommodations in advance but stay flexible with day plans around afternoon showers.