Climate averages 1991–2020
Porto Velho weather
in January.
A hot, very wet month: the 8th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in Porto Velho: daytime highs average 29.6°C and nights cool to about 23.4°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 303 mm of rain on roughly 29 days, which makes January a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 34 min on an average January day.
The nearest other city in this atlas is Ariquemes (159 km away). In January its highs average 29.5°C, about as warm as Porto Velho, with 281 mm of rain.
Among the 448 cities listed in Brazil, Porto Velho ranks joint 111th of 448 for the warmest January highs and 420th of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Porto Velho is 1.1°C warmer than that mean.
From January to February, average highs fall by 0.2°C to 29.4°C, and monthly rainfall rises from 303 mm to 318 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
Porto Velho climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 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 | 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
January in nearby cities
- Ariquemes in JanuaryBrazil · 159 kmHigh 29.5°C · Low 22.8°C · 281 mm rain
- Ji Paraná in JanuaryBrazil · 319 kmHigh 29.1°C · Low 22.8°C · 270 mm rain
- Riberalta in JanuaryBolivia · 343 kmHigh 29.6°C · Low 23.4°C · 269 mm rain
- Cacoal in JanuaryBrazil · 401 kmHigh 29.1°C · Low 22.7°C · 308 mm rain
- Rio Branco in JanuaryBrazil · 449 kmHigh 29.4°C · Low 22.9°C · 255 mm rain
- Coari in JanuaryBrazil · 527 kmHigh 29.1°C · Low 24.0°C · 285 mm rain
- Vilhena in JanuaryBrazil · 603 kmHigh 27.5°C · Low 21.0°C · 267 mm rain
- Tefé in JanuaryBrazil · 606 kmHigh 29.4°C · Low 23.6°C · 275 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.