The ecosystem of Mamori Lake is a lowland tropical rainforest with lush vegetation and abundant wildlife, including an astonishing variety of insects, fish and amphibians, birdlife, river dolphins, crocodiles, howler monkeys, etc.

Average annual temperature is about 25ºC, with very little seasonal variation. Days are typically hot and sunny (with maxima of about 30-35ºC), cooling down if there is rain. Nights can be comparatively fresh; with a minimum temperature of about 15-20 degrees. Humidity is very high (around 80-90%). The dry season goes from August to December. During this season rain is occasional, but not rare, and is typically short and abundant. During the rainy season (January to July) there is very frequent and intense rain, almost every day. Daylight is from about 6:00AM to 6:00PM, with almost no variation between seasons.