September in Kupang averages a daily high of 33.6°C. Rain is rare — about 0 wet days and 0mm across the month. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kupang is May–September.
Based on KUPANG ELTARI, ID (6.6km), 1995–2024. 20 years of September data.