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Rio Branco, Brazil climate

Am Tropical monsoon

Rio Branco has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is October with an average daily high near 92°F, while the coldest is July averaging around 65°F at night. Precipitation totals about 79 inches a year and is strongly seasonal — February alone averages 11.8 inches while July barely receives 1.11 inches.

☀️ All year

Hot

Daytime highs near 92°F most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 65°F.

🌧️ Rain

Very wet

About 79 in of rain a year.

Wettest in February

⛅ Sky & trend

Often cloudy

Cloudy skies 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)

Rio Branco climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	88	87	88	88	87	87	89	92	93	92	90	88
Avg temp (°F)	79	78	78	78	76	75	75	77	—	80	79	79
Avg low (°F)	73	73	73	72	69	67	65	66	69	72	73	73
Precipitation (in)	11.3	11.8	11.2	8.0	3.9	1.8	1.1	2.2	3.7	5.7	8.2	10.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	88	87	88	88	87	87
Avg temp (°F)	79	78	78	78	76	75
Avg low (°F)	73	73	73	72	69	67
Precipitation (in)	11.3	11.8	11.2	8.0	3.9	1.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	89	92	93	92	90	88
Avg temp (°F)	75	77	—	80	79	79
Avg low (°F)	65	66	69	72	73	73
Precipitation (in)	1.1	2.2	3.7	5.7	8.2	10.3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	87	87	85	76	66	52	41	49	63	77	82	85
Relative humidity (%)	92	92	93	92	91	89	82	72	70	75	84	90
Wind speed (mph)	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.2	0.1	0.1	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	87	87	85	76	66	52
Relative humidity (%)	92	92	93	92	91	89
Wind speed (mph)	0.2	0.2	0.2	0.2	0.3	0.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	41	49	63	77	82	85
Relative humidity (%)	82	72	70	75	84	90
Wind speed (mph)	0.3	0.3	0.2	0.1	0.1	0.1

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from INMET, Brazil's national meteorological institute, measured at Rio Branco, about 1 km from the city centre.

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 →