This area has a dry and a wet season with some sudden cold weather fronts throughout the year.

The bulk of the Biosphere Reserve lies within the watershed of the 250 km long Manu River, one of the many small rivers that flow out of the Andes and unite to form the mighty Amazon River.

Most of the lowland sections of the park (at 400 mts above sea level) receive about two meters of rain annually, which is only twice as much as New York City. Most of this rain falls from October or November through April or May. The dry months of the year are from June to September.

Daytime high temperature average in the lowland sections is 35°C (90°F), while night time low temperature average is 25ºC (79° F).

In any month of the year, however, unexpected Cold Fronts from the South can bring one or two days of heavy rain with daytime high temperatures of 18ºC (65° F) and night-time low temperatures of 10ºC (50° F).

HIGH SEASON: APRIL– DECEMBER

LOW SEASON: JANUARY - MARCH

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