Weather in Cacoal

Stay informed about the weather conditions when planning to visit Cacoal. Below you will find up-to-date data, detailed forecasts, and useful charts to help plan your time.

The climate of the city of Cacoal can be characterised as hot and tropical, with high temperatures throughout the year. It rarely gets cold here: even in the "coolest" months, such as June and July, night temperatures rarely drop below +20°C, and during the day the air consistently warms up to +30°C and above. This destination is perfect for those who love the heat, as the temperature regime here is remarkably consistent.

Instead of the usual four seasons, the weather here is clearly divided into two main seasons: wet and dry. The rainy season lasts from October to April, peaking in January and March, when rainfall occurs almost daily. During this period, humidity rises, and Brazil's nature appears in all its glory thanks to the abundant rainfall.

The dry season, falling during the winter months for the Southern Hemisphere (June, July, and August), is very pronounced. At this time, rains stop almost completely — for example, in July there may be no precipitation at all. This is the sunniest time of the year; however, by September, before the return of the rains, the heat intensifies, reaching annual maximums.

The city of Cacoal welcomes travellers with warmth all year round, but the temperature regime here has its own interesting features. The hottest time is not the calendar summer, but the period at the end of the dry season — August and September. In September, the average temperature reaches its peak around +29°C, and the daytime heat often exceeds the +34°C mark, creating an atmosphere of intense tropical heat.

The summer months (December to February), which coincide with the rainy season in Brazil, are characterised by milder but humid conditions. At this time, the average temperature stabilizes at +26°C. Daytime highs rarely exceed +30°C due to cloud cover, but high humidity can increase the sensation of heat. This is a period of steady temperatures without sharp fluctuations.

Winter (June to August), on the contrary, is characterised by significant daily fluctuations and almost complete absence of precipitation. Days during this period are sunny and very hot (up to +33°C in July), but nights bring pleasant coolness when the air cools down to +20°C. It is at this time that the difference between the daytime heat and the night freshness is felt most clearly, making the evenings comfortable for relaxation.

The climate of Cacoal is characterised by a clear division of the year into wet and dry seasons. The main rainy period here is long and covers the months from October to April. At this time, precipitation falls very frequently: for example, in January and March, the number of rainy days reaches a maximum — about 28–29 days per month. Travellers should be prepared for regular tropical downpours, which are an integral part of the local weather during this period.

The dry season begins in May and continues until September, bringing clear skies and minimal precipitation. The driest months are considered to be June, July, and August. July stands out in particular, when the probability of rain is reduced to almost zero (0 rainy days according to statistics). This time of year is best suited for those who want to avoid high humidity and enjoy sunny days.

Transitional months, such as May and September, demonstrate a gradual change in weather. In May, the rains begin to retreat (about 8 rainy days), and by September their frequency increases again (about 10 days with precipitation). When planning a trip to Brazil, be sure to take this schedule into account: for a trip at the beginning or end of the year, an umbrella and raincoat will be absolutely necessary.

When planning a trip to Cacoal, you should prepare for a hot tropical climate. The basis of your luggage should be light items made of natural breathable fabrics, such as cotton or linen, since the average daytime temperature here rarely drops below +26°C. Be sure to pack a wide-brimmed hat, sunglasses, and high-factor sunscreen, as the sun in Brazil is very active.

If your trip is scheduled for the period from October to April, be prepared for the rainy season: precipitation occurs very often, so a reliable umbrella, raincoat, and waterproof shoes will be essential items. In the dry season (June to August), there is practically no rain, but night temperatures can drop to +20°C. For evening walks and indoor spaces with powerful air conditioning, we recommend bringing a light sweater, cardigan, or windbreaker.

For comfortable exploration of the city and surroundings, comfortable walking shoes are indispensable, for example, light trainers or sandals with secure foot support. Given the high humidity in certain months, it is useful to have a spare pair of shoes with you. Also, do not forget about insect repellent, which will be useful during nature excursions.