Weather in Porto Velho

To ensure your journey is as comfortable as possible, it is important to check weather conditions in advance. In this section, we have compiled up-to-date information for you about the weather in the city of Porto Velho, including forecasts and visual charts.

The climate of Porto Velho can be characterized as hot and tropical, with high humidity and stable warm temperatures throughout the year. Located in Brazil, this city does not experience cold weather: the average air temperature here fluctuates between 26–29°C, creating ideal conditions for heat lovers. Even on the "coolest" nights, the thermometer rarely drops below 22°C, so you will hardly need warm clothes.

Two seasons are clearly traceable in the weather: a long wet season and a short dry one. From October to May, the city is dominated by rains: in these months, precipitation falls very frequently, peaking from January to March, when there can be up to 30 rainy days per month. However, the rains here are usually warm and contribute to the lush growth of local flora. Conversely, the period from June to August is considered the dry season. At this time, the amount of rainfall drops sharply, and July often delights tourists with a complete absence of rain and an abundance of sunny days.

It is noteworthy that the highest temperatures in Porto Velho are recorded not in the middle of the year, but closer to the end of the dry season. In August and September, the air warms up the most, reaching marks of 34–35°C. Travellers should take this factor into account: if you prefer dry and clear weather, plan your trip for the middle of the year, but be prepared for intense sun and heat.

The climate in Porto Velho is distinguished by consistently high temperatures year-round, which is characteristic of the tropical Amazon region. Throughout the year, the air remains warm, and the concept of cold here is quite relative. The hottest month traditionally becomes September, when the average temperature rises to 29.6°C, and daily maximums often reach the 34.7°C mark. Even in relatively "cool" months, such as February, average figures confidently hold at the level of 26.6°C.

The Brazilian "winter" (from June to August) coincides here with the dry season and brings interesting temperature contrasts. At this time, rains practically cease, the sky clears, and the sun warms the air even more strongly than in summer: in August, the heat can reach up to 34°C. However, it is during this period that nights become the freshest and most pleasant, with minimum temperatures around 22.1°C in July. The summer period (from December to March), on the contrary, is more humid, due to which the daytime heat is held back by cloudiness (around 30°C), but nights remain quite warm — around 23.7°C.

Travellers should take into account diurnal temperature fluctuations, which are especially noticeable in the cloudless dry season. If in wet months the difference between day and night is about 6 degrees, then in July and August the range increases to 11–12 degrees. This means that after strong daytime heat, a time for relatively comfortable evenings arrives. In general, the weather in Porto Velho remains hot year-round, requiring tourists to have light clothing and readiness for tropical heat.

The climate of Porto Velho has a pronounced tropical character with a clear division into wet and dry periods. The main rainy season here lasts most of the year, beginning in October and continuing right up to May. The wettest months are January, March, and December, when the number of rainy days reaches 28–30 per month. At this time, travellers should be prepared for regular and heavy tropical downpours, which often occur in the afternoon.

The dry season in Porto Velho is relatively short and falls on the winter months of the Southern Hemisphere — June, July, and August. July is considered the absolute record holder for dryness: statistics show that in this month there may be no precipitation at all (0 rainy days). June and August also delight with sunny weather, when rains happen extremely rarely, only about 5–6 times a month.

Transitional periods, such as May and September, are characterized by changing weather conditions. While in May precipitation intensity begins to subside (about 15 rainy days), by September humidity rises again. When planning a trip during the rainy season, be sure to ensure you have an umbrella and waterproof clothing, as downpours in this region of Brazil can be sudden and strong.

Given the hot tropical climate of Porto Velho, the basis of your luggage should consist of light and loose clothing made from natural fabrics, such as cotton or linen. The average temperature here remains around 27°C year-round, and in the hottest months (August and September) it can rise to 34°C. Be sure to take comfortable open shoes and a wide-brimmed hat for protection from the strong sun.

The choice of additional items depends on the time of your trip. If you are planning a visit during the rainy season (from December to April), when precipitation falls almost every day, do not forget to pack a compact umbrella, a light raincoat, and quick-drying shoes. In the dry season (from June to August), there is practically no rain, so the emphasis should be placed on enhanced sun protection and skin hydration.

Despite the heat, it is recommended to take one light cardigan or long-sleeved shirt for protection against air conditioners indoors or insects in the evening. By the way, insect repellent is a mandatory item on the packing list for travelling in this region of Brazil. Also, do not forget sunscreen with a high protection factor, as the sun here is very intense at any time of the year.