September in Medan averages a daily high of 31.8°C with nights around 23.3°C. Expect roughly 9.3 wet days totalling 133.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Medan is December–July.
Based on POLONIA, ID (2.9km), 1995–2024. 16 years of September data.