Planning for the weather is a good way to make your trip to Banjarmasin relaxing and enjoyable, especially when you're splurging. The hottest months are usually October and September, with an average temperature of 27°C, while the coldest months are July and August, with an average of 27°C. The rainiest months in Banjarmasin are December, March, January and November, with each month seeing an average of 338 mm of rainfall.