Climate averages 1991–2020
Rio Branco weather
in January.
A hot, very wet month: the 7th 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 Branco: daytime highs average 29.4°C and nights cool to about 22.9°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 255 mm of rain on roughly 28 days, which makes January a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 38 min on an average January day.
The nearest other city in this atlas is Riberalta (224 km away). In January its highs average 29.6°C, about as warm as Rio Branco, with 269 mm of rain.
Among the 448 cities listed in Brazil, Rio Branco ranks joint 128th of 448 for the warmest January highs and joint 326th of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Rio Branco is 0.9°C warmer than that mean.
From January to February, average highs fall by 0.2°C to 29.2°C, and monthly rainfall falls from 255 mm to 243 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 Branco climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 29.4°C22.9°C | 22.9°C | 255 | 27.6 | 12.613 h |
| February | 29.2°C22.8°C | 22.8°C | 243 | 25.3 | 12.412 h |
| March | 29.2°C22.8°C | 22.8°C | 249 | 27.2 | 12.212 h |
| April | 28.9°C22.4°C | 22.4°C | 160 | 22.7 | 11.912 h |
| May | 28.4°C21.6°C | 21.6°C | 76 | 15.4 | 11.712 h |
| June | 28.9°C20.9°C | 20.9°C | 30 | 6.8 | 11.612 h |
| July | 30.4°C20.4°C | 20.4°C | 21 | 4.2 | 11.612 h |
| August | 32.1°C21.4°C | 21.4°C | 38 | 6.3 | 11.812 h |
| September | 32.4°C22.7°C | 22.7°C | 76 | 11.9 | 12.012 h |
| October | 31.5°C23.0°C | 23.0°C | 137 | 19.5 | 12.312 h |
| November | 30.1°C22.9°C | 22.9°C | 199 | 22.9 | 12.613 h |
| December | 29.5°C23.0°C | 23.0°C | 246 | 26.3 | 12.713 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
- Riberalta in JanuaryBolivia · 224 kmHigh 29.6°C · Low 23.4°C · 269 mm rain
- Puerto Maldonado in JanuaryPeru · 328 kmHigh 29.3°C · Low 23.0°C · 369 mm rain
- Porto Velho in JanuaryBrazil · 449 kmHigh 29.6°C · Low 23.4°C · 303 mm rain
- Ariquemes in JanuaryBrazil · 522 kmHigh 29.5°C · Low 22.8°C · 281 mm rain
- Cruzeiro do Sul in JanuaryBrazil · 595 kmHigh 29.6°C · Low 22.7°C · 239 mm rain
- Cusco in JanuaryPeru · 601 kmHigh 15.4°C · Low 8.2°C · 229 mm rain
- Trinidad in JanuaryBolivia · 626 kmHigh 29.3°C · Low 23.6°C · 330 mm rain
- Ji Paraná in JanuaryBrazil · 649 kmHigh 29.1°C · Low 22.8°C · 270 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 Branco) is explained once on the Rio Branco year overview and on the Sources, method and limits page.