Climate averages 1991–2020
Rio Branco weather
in August.
A hot, fairly dry month: the 2nd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Rio Branco: daytime highs average 32.1°C and nights cool to about 21.4°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 38 mm of rain on roughly 6 days, which makes August a fairly dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 47 min on an average August day.
The nearest other city in this atlas is Riberalta (224 km away). In August its highs average 31.9°C, about as warm as Rio Branco, with 40 mm of rain.
Among the 448 cities listed in Brazil, Rio Branco ranks joint 48th of 448 for the warmest August highs and joint 255th of 448 for the driest August (rainfall, lowest first). The mean August high of those 448 cities is 26.2°C; Rio Branco is 5.9°C warmer than that mean.
From August to September, average highs rise by 0.3°C to 32.4°C, and monthly rainfall rises from 38 mm to 76 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Riberalta in AugustBolivia · 224 kmHigh 31.9°C · Low 21.8°C · 40 mm rain
- Puerto Maldonado in AugustPeru · 328 kmHigh 30.1°C · Low 20.8°C · 62 mm rain
- Porto Velho in AugustBrazil · 449 kmHigh 33.0°C · Low 22.9°C · 42 mm rain
- Ariquemes in AugustBrazil · 522 kmHigh 33.9°C · Low 22.4°C · 32 mm rain
- Cruzeiro do Sul in AugustBrazil · 595 kmHigh 30.2°C · Low 21.6°C · 71 mm rain
- Cusco in AugustPeru · 601 kmHigh 15.7°C · Low 5.4°C · 22 mm rain
- Trinidad in AugustBolivia · 626 kmHigh 30.3°C · Low 20.6°C · 50 mm rain
- Ji Paraná in AugustBrazil · 649 kmHigh 33.6°C · Low 21.9°C · 23 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.