Climate averages 1991–2020
Porto Velho weather
in August.
A hot, moderately wet month: the warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Porto Velho: daytime highs average 33.0°C and nights cool to about 22.9°C. By daytime temperature it is the warmest month of the year.
Expect about 42 mm of rain on roughly 8 days, which makes August a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 50 min on an average August day.
The nearest other city in this atlas is Ariquemes (159 km away). In August its highs average 33.9°C, 1.0°C warmer than Porto Velho, with 32 mm of rain.
Among the 448 cities listed in Brazil, Porto Velho ranks joint 31st of 448 for the warmest August highs and joint 276th of 448 for the driest August (rainfall, lowest first). The mean August high of those 448 cities is 26.2°C; Porto Velho is 6.8°C warmer than that mean.
From August to September, average highs fall by 0.4°C to 32.6°C, and monthly rainfall rises from 42 mm to 103 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
Porto Velho climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C23.4°C | 23.4°C | 303 | 28.6 | 12.613 h |
| February | 29.4°C23.3°C | 23.3°C | 318 | 27.0 | 12.412 h |
| March | 29.3°C23.4°C | 23.4°C | 328 | 29.4 | 12.212 h |
| April | 29.2°C23.3°C | 23.3°C | 228 | 26.4 | 11.912 h |
| May | 29.1°C22.9°C | 22.9°C | 133 | 21.4 | 11.712 h |
| June | 29.7°C22.3°C | 22.3°C | 43 | 9.5 | 11.612 h |
| July | 31.3°C21.9°C | 21.9°C | 22 | 4.7 | 11.712 h |
| August, selected | 33.0°C22.9°C | 22.9°C | 42 | 7.5 | 11.812 h |
| September | 32.6°C23.8°C | 23.8°C | 103 | 16.7 | 12.012 h |
| October | 31.7°C23.9°C | 23.9°C | 178 | 23.2 | 12.312 h |
| November | 30.3°C23.7°C | 23.7°C | 245 | 26.2 | 12.513 h |
| December | 29.7°C23.5°C | 23.5°C | 298 | 28.7 | 12.613 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
- Ariquemes in AugustBrazil · 159 kmHigh 33.9°C · Low 22.4°C · 32 mm rain
- Ji Paraná in AugustBrazil · 319 kmHigh 33.6°C · Low 21.9°C · 23 mm rain
- Riberalta in AugustBolivia · 343 kmHigh 31.9°C · Low 21.8°C · 40 mm rain
- Cacoal in AugustBrazil · 401 kmHigh 33.7°C · Low 21.5°C · 26 mm rain
- Rio Branco in AugustBrazil · 449 kmHigh 32.1°C · Low 21.4°C · 38 mm rain
- Coari in AugustBrazil · 527 kmHigh 29.9°C · Low 24.3°C · 96 mm rain
- Vilhena in AugustBrazil · 603 kmHigh 31.0°C · Low 19.6°C · 24 mm rain
- Tefé in AugustBrazil · 606 kmHigh 29.7°C · Low 23.4°C · 119 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 Porto Velho) is explained once on the Porto Velho year overview and on the Sources, method and limits page.