Porto Velho climate
Porto Velho (Rondônia, Brazil) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 27 °C80 °F, and about 1,711 mm67 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Porto Velho climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2883 | 2374 | 2678 | 25410.0 |
| Feb | 2883 | 2374 | 2678 | 2419.5 |
| Mar | 2883 | 2374 | 2678 | 2299.0 |
| Apr | 2883 | 2374 | 2678 | 1726.8 |
| May | 2883 | 2373 | 2578 | 943.7 |
| Jun | 2985 | 2271 | 2578 | 321.3 |
| Jul | 3289 | 2171 | 2780 | 200.8 |
| Aug | 3494 | 2272 | 2883 | 391.5 |
| Sep | 3494 | 2475 | 2984 | 833.3 |
| Oct | 3391 | 2475 | 2883 | 1475.8 |
| Nov | 3188 | 2475 | 2781 | 1546.1 |
| Dec | 2984 | 2374 | 2679 | 2469.7 |
| Year | 3494 | 2171 | 2780 | 1,71167 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 91% | 89% | 4.6 | 12:35 |
| Feb | 91% | 89% | 4.5 | 12:24 |
| Mar | 91% | 88% | 4.5 | 12:10 |
| Apr | 91% | 81% | 4.6 | 11:55 |
| May | 90% | 69% | 4.5 | 11:43 |
| Jun | 86% | 45% | 4.9 | 11:37 |
| Jul | 75% | 34% | 5.3 | 11:39 |
| Aug | 65% | 47% | 5.2 | 11:50 |
| Sep | 68% | 67% | 5.0 | 12:04 |
| Oct | 75% | 82% | 5.1 | 12:19 |
| Nov | 82% | 87% | 4.8 | 12:32 |
| Dec | 89% | 88% | 4.5 | 12:38 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Porto Velho is like
The warmest month is September, with an average high of 34 °C94 °F and a low of 24 °C75 °F. The coldest is May, when highs average 28 °C83 °F and lows 23 °C73 °F. Seasonal differences are small — just 3.6 °C6.5 °F between the warmest and the coolest month.
It is wet, with about 1,711 mm67 in of precipitation per year. The wettest three-month stretch is December–February, which brings 43% of the annual total. The wettest month is January (254 mm10.0 in), the driest is July (20 mm0.8 in).
Relative humidity ranges from 65% in August to 91% in March. The clearest skies (lowest average cloud amount, 34%) are typical of July. Average wind speed near the ground ranges from 0 km/h (0 mph) in October to 1 km/h (0 mph) in June. Daylight lasts from about 11.6 hours in June to 12.6 hours in December.
Best time to visit Porto Velho
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June and July: average highs of 29 °C85 °F to 32 °C89 °F with 20 mm0.8 in to 32 mm1.3 in of precipitation per month.
The most challenging month is January, which is very wet (254 mm10.0 in) and humid (91% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Porto Velho
- Wetter months (October–April) — highs 2883 to 33 °C91 °F, lows 2374 to 24 °C75 °F, about 206 mm8.1 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (May–September) — highs 2883 to 34 °C94 °F, lows 2171 to 24 °C75 °F, about 54 mm2.1 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
How Porto Velho compares
Of the 223 places in Brazil covered by World Climates, Porto Velho is the 45th warmest by annual mean temperature and the 24th wettest by annual precipitation. See all of them on the Brazil climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Ebute Ikorodu (Nigeria, Aw), Lagos (Nigeria, Aw) and Warri (Nigeria, Aw).
Nearby places
- Ji Paraná 319 km · 27 °C80 °F · 1,554 mm61 in
- Rio Branco 449 km · 26 °C78 °F · 1,737 mm68 in
- Vilhena 603 km · 23 °C74 °F · 1,738 mm68 in
- Manacapuru 708 km · 27 °C81 °F · 2,006 mm79 in
- Manaus 762 km · 27 °C81 °F · 1,959 mm77 in
- Leticia 837 km · 26 °C79 °F · 2,558 mm101 in
- Itacoatiara 869 km · 27 °C81 °F · 2,077 mm82 in
- Tangará da Serra 955 km · 25 °C78 °F · 1,458 mm57 in
Frequently asked questions
What is the warmest month in Porto Velho?
September is the warmest month in Porto Velho, with an average high of 34 °C (94 °F) and an average low of 24 °C (75 °F).
What is the coldest month in Porto Velho?
May is the coldest month, with an average high of 28 °C (83 °F) and an average low of 23 °C (73 °F).
When does it rain the most in Porto Velho?
January is the wettest month with about 254 mm (10.0 in) of precipitation; July is the driest with about 20 mm (0.8 in).
What is the best time to visit Porto Velho?
Judging by long-term averages, the most comfortable months are June and July.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.