Climate averages 1991–2020
Rio de Janeiro weather
in January.
A hot, wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in Rio de Janeiro: daytime highs average 30.7°C and nights cool to about 23.5°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 170 mm of rain on roughly 16 days, which makes January a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 22 min on an average January day.
The nearest other city in this atlas is São Gonçalo (16 km away). In January its highs average 30.1°C, 0.6°C cooler than Rio de Janeiro, with 244 mm of rain.
Among the 448 cities listed in Brazil, Rio de Janeiro ranks joint 44th of 448 for the warmest January highs and joint 132nd of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Rio de Janeiro is 2.2°C warmer than that mean.
From January to February, average highs rise by 0.5°C to 31.2°C, and monthly rainfall falls from 170 mm to 118 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Rio de Janeiro climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 30.7°C23.5°C | 23.5°C | 170 | 16.4 | 13.413 h |
| February | 31.2°C23.6°C | 23.6°C | 118 | 13.3 | 12.913 h |
| March | 29.6°C23.0°C | 23.0°C | 145 | 16.7 | 12.212 h |
| April | 28.0°C21.4°C | 21.4°C | 88 | 12.0 | 11.612 h |
| May | 25.6°C19.0°C | 19.0°C | 76 | 11.1 | 11.011 h |
| June | 25.2°C17.8°C | 17.8°C | 48 | 7.3 | 10.811 h |
| July | 24.9°C17.1°C | 17.1°C | 51 | 7.9 | 10.911 h |
| August | 25.9°C17.5°C | 17.5°C | 41 | 7.5 | 11.311 h |
| September | 26.8°C18.6°C | 18.6°C | 75 | 10.5 | 11.912 h |
| October | 28.0°C20.0°C | 20.0°C | 92 | 11.7 | 12.613 h |
| November | 28.0°C21.0°C | 21.0°C | 139 | 15.8 | 13.213 h |
| December | 29.7°C22.6°C | 22.6°C | 151 | 16.2 | 13.514 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- São Gonçalo in JanuaryBrazil · 16 kmHigh 30.1°C · Low 23.0°C · 244 mm rain
- Duque de Caxias in JanuaryBrazil · 19 kmHigh 30.9°C · Low 23.2°C · 265 mm rain
- Barra da Tijuca in JanuaryBrazil · 21 kmHigh 31.2°C · Low 23.9°C · 170 mm rain
- Belford Roxo in JanuaryBrazil · 27 kmHigh 31.0°C · Low 23.4°C · 235 mm rain
- Magé in JanuaryBrazil · 32 kmHigh 30.1°C · Low 22.7°C · 244 mm rain
- Nova Iguaçu in JanuaryBrazil · 32 kmHigh 31.0°C · Low 23.1°C · 235 mm rain
- Maricá in JanuaryBrazil · 37 kmHigh 29.9°C · Low 23.9°C · 126 mm rain
- Itaboraí in JanuaryBrazil · 38 kmHigh 29.7°C · Low 22.5°C · 259 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rio de Janeiro) is explained once on the Rio de Janeiro year overview and on the Sources, method and limits page.
Barra da Tijuca lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.