Weather in Manaus

Rain is the monsoon runs from October to June, inside an annual total of 1959 mm. The wettest month is March at 268 mm; the driest is August at 50 mm.

Manaus is in Brazil at 3.1°S. The 2001–2020 NASA POWER daily record describes a monsoon climate with a sharp wet-dry split. October is the warmest month (average 29.4°C, high 32.9°C) and June is the coolest (average 26.2°C, low 24.0°C). On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are April, June, and July.

Best months to visit Manaus

The three months with the highest comfort score are April, June, and July: April (26.3°C average, 262 mm, 89% humidity); June (26.2°C average, 119 mm, 89% humidity); July (26.5°C average, 76 mm, 86% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the monsoon itself — fewer crowds, greener landscape, heavier rain — aim at October–June instead of the score.

Hot and cool months in Manaus

Monthly average highs run from 28.3°C in June to 32.9°C in October. Nights follow the same curve: 24.0°C in June and 26.0°C in October.

Mean high across all twelve months is 29.8°C and mean low is 24.7°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

Monsoon and dry months

The monsoon in Manaus starts in October and ends in June (October, November, December, January, February, March, April, May, and June). March is the core of it at 268 mm. August is the other extreme, with 50 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. March averages 26 such days; August averages 12.

Distinctive months in Manaus

March is the wettest month — 268 mm and 26 rainy days, with 89% humidity. May stands apart from the months beside it: 28.3°C / 24.5°C and 205 mm. By June the monsoon is ending. Manaus still sees about 119 mm, but the next month is usually leaner.

August is the driest month, averaging only 50 mm across 12 rainy days. Highs sit near 30.8°C. October is when the monsoon typically starts in Manaus: highs near 32.9°C, and rainfall jumps to 103 mm (17 rainy days). In December, Manaus averages 29.7°C by day and 24.9°C at night, with 213 mm of rain.

How Manaus compares inside Brazil

Belém is about 1293 km away: Manaus is about as warm as Belém at the hot peak and 610 mm drier over the year than Belém. Belém’s wettest month is March (411 mm) versus March here.

Goiânia is about 1914 km away: Manaus is 2.6°C warmer than Goiânia in its hottest month and 560 mm wetter over the year than Goiânia. Goiânia’s wettest month is January (239 mm) versus March here.

Brasília is about 1934 km away: Manaus is 3.8°C warmer than Brasília in its hottest month and 656 mm wetter over the year than Brasília. Brasília’s wettest month is December (221 mm) versus March here.