Climate averages 1991–2020
Porto Velho weather
by month.
See how the year changes. August has the highest average daily maximum; July has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Porto Velho averages a daytime high of 30.4°C and a nighttime low of 23.2°C, with about 2,242 mm of rain on roughly 249 days. August is the warmest month (average high 33.0°C) and May the coolest (29.1°C). March is the wettest month with 328 mm; July is the driest with 22 mm.
The annual picture
A year in Porto Velho
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 | 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
Nearby cities
- AriquemesBrazil · 159 kmHigh 30.8°C · Low 22.6°C · 1,860 mm rain a year
- Ji ParanáBrazil · 319 kmHigh 30.6°C · Low 22.4°C · 1,737 mm rain a year
- RiberaltaBolivia · 343 kmHigh 30.0°C · Low 22.7°C · 1,864 mm rain a year
- CacoalBrazil · 401 kmHigh 30.6°C · Low 22.2°C · 1,928 mm rain a year
- Rio BrancoBrazil · 449 kmHigh 30.0°C · Low 22.2°C · 1,728 mm rain a year
- CoariBrazil · 527 kmHigh 29.3°C · Low 24.1°C · 2,646 mm rain a year
- VilhenaBrazil · 603 kmHigh 28.5°C · Low 20.3°C · 1,732 mm rain a year
- TeféBrazil · 606 kmHigh 29.4°C · Low 23.5°C · 2,809 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-4, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at -8.80°, -63.90° (4 km from the city centre). Rain comes from the 0.25° cell at -8.75°, -64.00°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.