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Available sources do not identify one specific weekday, such as Monday or Tuesday, as consistently the quietest. What is clear is that Saturday and Sunday, along with local holidays and school-holiday periods, are busier than weekday visits, and safari queues often grow from mid-morning into midday.
For the smoothest visit on any day, arrive at or near opening and do the Safari Journey first. If you visit on Saturday or Sunday, allow extra time for ticket checks, security, safari boarding, and getting to popular shows early, as seating can fill up in peak holiday periods.
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May to September is generally the preferred period for visiting Bali Safari & Marine Park because the drier weather brings fewer sudden downpours and makes outdoor walking more comfortable. That said, this is also when conditions are most attractive for visitors, so you should still expect heavier demand during school holidays and other peak travel periods. In busy months, arriving near opening is the best way to reduce safari waits and fit in shows before midday heat.
Outside May to September, the research does not define an official low season by month, but visitors should be more prepared for rain and humidity. The park can still be visited in wetter periods, and indoor areas such as the aquarium can help break up the day during downpours or midday heat.