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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 33°C, while the coldest is July averaging around 18°C at night. Precipitation totals about 2011 mm a year and is strongly seasonal — February alone averages 299 mm while July barely receives 28 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours 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 (°C) | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 33 | 34 | 33 | 32 | 31 |
| Avg temp (°C) | 26 | 26 | 26 | 26 | 25 | 24 | 24 | 25 | — | 26 | 26 | 26 |
| Avg low (°C) | 23 | 23 | 23 | 22 | 21 | 19 | 18 | 19 | 21 | 22 | 23 | 23 |
| Precipitation (mm) | 286 | 299 | 286 | 204 | 99 | 45 | 28 | 57 | 94 | 144 | 209 | 261 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 31 | 31 | 31 | 31 |
| Avg temp (°C) | 26 | 26 | 26 | 26 | 25 | 24 |
| Avg low (°C) | 23 | 23 | 23 | 22 | 21 | 19 |
| Precipitation (mm) | 286 | 299 | 286 | 204 | 99 | 45 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 33 | 34 | 33 | 32 | 31 |
| Avg temp (°C) | 24 | 25 | — | 26 | 26 | 26 |
| Avg low (°C) | 18 | 19 | 21 | 22 | 23 | 23 |
| Precipitation (mm) | 28 | 57 | 94 | 144 | 209 | 261 |
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 (m/s) | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | 0.1 | 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 (m/s) | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 |
| 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 (m/s) | 0.2 | 0.1 | 0.1 | 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.