Climate Insights for Porto Velho

The climate in Porto Velho is warm and mild. The average annual temperature is 21°C and approximately 201mm of precipitation falls per year. December is the wettest month, receiving around 33mm of rainfall. Porto Velho sits near the equator, so seasonal temperature differences are minimal throughout the year.

Porto Velho sees moderate temperature variation throughout the year, ranging from 11°C to 28°C. The warmest month is June, when average highs reach 28°C and the mean temperature sits around 19°C. July is the coolest month, with minimum temperatures around 11°C and an average of 17°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between August and September, with a 8°C shift in average temperatures.

Porto Velho is a quite dry location, receiving approximately 201mm of precipitation annually, which averages out to around 17mm per month. The wettest month is January, averaging 33mm of rainfall. September and October also tend to see above-average precipitation. The driest month is May, with just 0mm. That's 33mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Porto Velho is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 9km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to pick up during the summer months. The seasonal averages are 2km/h in winter, 7km/h in spring, 6km/h in summer, 6km/h in autumn.

It is currently winter in Porto Velho, which began on June 21, 2026. Porto Velho sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in June at around 28°C, while the coldest stretch bottoms out in July near 11°C. Spring is next, beginning on September 23, 2026 — 16 days from now.

The best time to visit Porto Velho is during January, February, March, April, May, June, July, August, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 17mm per month. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Porto Velho based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.