May in Banjarmasin averages a daily high of 32.9°C with nights around 24°C. Expect roughly 7 wet days totalling 55.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Banjarmasin is March–April.
Based on SYAMSUDIN NOOR, ID (23.5km), 1995–2024. 18 years of May data.