Porto Velho (Portuguese pronunciation: [ˈpoʁtu ˈvɛʎu], Old Port) is the capital of the Brazilian state of Rondônia, in the upper Amazon River basin. The population is 539,354 people (as of the IBGE 2020 estimation). Located on the border of Rondônia and the state of Amazonas, the town is an important trading center for cassiterite, the mining of which represents the most important economic activity in the region, as well as a transportation and communication center. It is on the eastern shore of the Madeira River, one of the main tributaries of the Amazon River. It is also Rondônia's largest city, and the largest state capital of Brazil by area.

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Porto Velho features a tropical monsoon climate (climate type Am) under the Köppen climate classification. The temperatures tend to be relatively consistent throughout the year, with average daily temperatures typically between 25 and 26 degrees Celsius. The dry season is short and covers the months of June, July and August. In July, the average temperature is 26.2oC (79.2oF), with a maximum of 31.5 oC (88.7 oF) and a minimum of 22.1oC (71.8 oF). (Source: Wikipedia and ClimaTempo.com.br). In other words, come prepared for hot weather.