September in Ayutthaya is quite warm, with temperatures ranging from a high of 33°C to a low of 25°C. The heat is quite intense, making it feel like a typical tropical climate. The wind speed is moderate, blowing at around 13 km/h, which provides a bit of relief from the heat.
The month also sees a significant amount of rainfall, with about 290 mm falling throughout the month. This makes the weather quite humid and damp. Despite the rain, there’s still a bit of sunshine, although not much. Overall, the weather in Ayutthaya in September is a mix of heat, wind, and rain.