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Rio de Janeiro, Brazil climate
BSh Hot semi-arid
Rio de Janeiro has a mildly seasonal tropical climate (Hot semi-arid, Köppen BSh). The hottest month is February with an average daily high near 33°C, while the coldest is July averaging around 17°C at night. Precipitation totals about 417 mm a year and is strongly seasonal — December alone averages 67 mm while July barely receives 7 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 de Janeiro climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 33 | 31 | 30 | 27 | 27 | 27 | 27 | 28 | 29 | 29 | 31 |
| Avg temp (°C) | 28 | 28 | 27 | 26 | 23 | 22 | 22 | 22 | 23 | 25 | 25 | 27 |
| Avg low (°C) | 24 | 24 | 23 | 22 | 19 | 18 | 17 | 18 | 19 | 21 | 22 | 23 |
| Precipitation (mm) | 54 | 55 | 50 | 24 | 14 | 11 | 7 | 11 | 26 | 35 | 65 | 67 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 33 | 31 | 30 | 27 | 27 |
| Avg temp (°C) | 28 | 28 | 27 | 26 | 23 | 22 |
| Avg low (°C) | 24 | 24 | 23 | 22 | 19 | 18 |
| Precipitation (mm) | 54 | 55 | 50 | 24 | 14 | 11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 27 | 28 | 29 | 29 | 31 |
| Avg temp (°C) | 22 | 22 | 23 | 25 | 25 | 27 |
| Avg low (°C) | 17 | 18 | 19 | 21 | 22 | 23 |
| Precipitation (mm) | 7 | 11 | 26 | 35 | 65 | 67 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 63 | 66 | 55 | 54 | 47 | 44 | 45 | 58 | 68 | 77 | 74 |
| Relative humidity (%) | 84 | 83 | 84 | 82 | 81 | 80 | 79 | 78 | 78 | 80 | 82 | 84 |
| Wind speed (mph) | 5.5 | 5.5 | 5.5 | 5.9 | 6.2 | 6.0 | 6.5 | 6.7 | 7.1 | 6.7 | 6.2 | 5.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 63 | 66 | 55 | 54 | 47 |
| Relative humidity (%) | 84 | 83 | 84 | 82 | 81 | 80 |
| Wind speed (mph) | 5.5 | 5.5 | 5.5 | 5.9 | 6.2 | 6.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 44 | 45 | 58 | 68 | 77 | 74 |
| Relative humidity (%) | 79 | 78 | 78 | 80 | 82 | 84 |
| Wind speed (mph) | 6.5 | 6.7 | 7.1 | 6.7 | 6.2 | 5.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Galeao Antonio Carlos Jobim, a weather station, about 13 km from the city centre. The underlying daily records come from NOAA's global station network.
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.