Manaus, Brazil climate

Am Tropical monsoon

Manaus has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is September with an average daily high near 34°C, while the coldest is January averaging around 24°C at night. Precipitation totals about 2362 mm a year and is strongly seasonal — April alone averages 331 mm while August barely receives 56 mm.

☀️ All year

Hot

Daytime highs near 34°C most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 24°C.

🌧️ Rain

Very wet

About 2362 mm of rain a year.

Wettest in April

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Manaus climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	31	31	31	31	32	32	33	34	34	34	33	32
Avg temp (°C)	27	27	27	27	27	27	28	28	29	29	28	27
Avg low (°C)	24	24	24	24	24	24	24	24	25	25	24	24
Precipitation (mm)	306	297	321	331	233	117	67	56	79	114	188	253

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	31	31	31	31	32	32
Avg temp (°C)	27	27	27	27	27	27
Avg low (°C)	24	24	24	24	24	24
Precipitation (mm)	306	297	321	331	233	117

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	34	34	34	33	32
Avg temp (°C)	28	28	29	29	28	27
Avg low (°C)	24	24	25	25	24	24
Precipitation (mm)	67	56	79	114	188	253

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	85	85	87	85	80	67	57	59	69	76	82	82
Relative humidity (%)	87	89	89	89	89	89	86	80	74	73	78	84
Wind speed (m/s)	0.6	0.7	0.7	0.6	0.6	0.7	0.7	0.7	0.7	0.6	0.6	0.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	85	85	87	85	80	67
Relative humidity (%)	87	89	89	89	89	89
Wind speed (m/s)	0.6	0.7	0.7	0.6	0.6	0.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	59	69	76	82	82
Relative humidity (%)	86	80	74	73	78	84
Wind speed (m/s)	0.7	0.7	0.7	0.6	0.6	0.6

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from INMET, Brazil's national meteorological institute, measured at Manaus, inside the city.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →