Climate averages 1991–2020
Porto Velho weather
in May.
A hot, wet month: the coolest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Porto Velho: daytime highs average 29.1°C and nights cool to about 22.9°C. By daytime temperature it is the coolest month of the year.
Expect about 133 mm of rain on roughly 21 days, which makes May a wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 43 min on an average May day.
The nearest other city in this atlas is Ariquemes (159 km away). In May its highs average 29.3°C, about as warm as Porto Velho, with 91 mm of rain.
Among the 448 cities listed in Brazil, Porto Velho ranks joint 68th of 448 for the warmest May highs and joint 377th of 448 for the driest May (rainfall, lowest first). The mean May high of those 448 cities is 25.3°C; Porto Velho is 3.7°C warmer than that mean.
From May to June, average highs rise by 0.7°C to 29.7°C, and monthly rainfall falls from 133 mm to 43 mm.
The annual picture
May 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, selected | 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
May in nearby cities
- Ariquemes in MayBrazil · 159 kmHigh 29.3°C · Low 22.2°C · 91 mm rain
- Ji Paraná in MayBrazil · 319 kmHigh 29.2°C · Low 21.8°C · 78 mm rain
- Riberalta in MayBolivia · 343 kmHigh 28.5°C · Low 22.0°C · 81 mm rain
- Cacoal in MayBrazil · 401 kmHigh 29.3°C · Low 21.6°C · 77 mm rain
- Rio Branco in MayBrazil · 449 kmHigh 28.4°C · Low 21.6°C · 76 mm rain
- Coari in MayBrazil · 527 kmHigh 28.4°C · Low 23.7°C · 297 mm rain
- Vilhena in MayBrazil · 603 kmHigh 27.5°C · Low 19.4°C · 57 mm rain
- Tefé in MayBrazil · 606 kmHigh 28.5°C · Low 23.2°C · 329 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.