Guajara-Mirim

Planning your day in Guajará-Mirim? Here you will find the latest weather information, including up-to-date forecasts and handy charts.

The climate in Guajará-Mirim can be described as hot and tropical, typical of this region of Brazil. Cold weather is virtually non-existent here, and the weather is remarkably stable, staying warm year-round. Travelers should expect high humidity and temperatures that rarely drop below comfortable levels, even at night.

There are two distinct seasons throughout the year. The rainy season lasts from November to April, with very frequent rainfall — in January and March, the number of rainy days can reach 27–28 per month. During this time, nature comes alive, but tourists will definitely need umbrellas and raincoats for sightseeing.

From June to August, the dry season arrives, which many consider the best time to visit. In July, for example, the rain almost stops, and clear weather sets in. The hottest period falls in early spring (September-October), when daytime temperatures can rise to 34°C and above.

Throughout the year, Guajará-Mirim maintains consistently warm weather, with the average annual temperature ranging from a comfortable 25.5°C to 29.2°C. The concept of "cold" is quite relative here, though the heat intensity varies by month. Traditionally, the hottest period is September, when average figures peak and the daytime heat is most intense.

Even during the Southern Hemisphere's winter (June to August), the temperature regime resembles summer in temperate latitudes. The average temperature during these months is around 26°C. A hallmark of this season is the fresher nights: for example, in July, the minimum temperature can drop to 20.5°C, bringing pleasant coolness and a break from the daytime sun.

It's important for travelers to consider daily temperature fluctuations. During the day, the air warms up quickly, and the thermometer often crosses the 30°C mark, reaching a peak of 34.6°C in September. However, the heat subsides after sunset, and evenings become mild (averaging 21–23°C), which is ideal for outdoor dining or strolls.

Precipitation in Guajará-Mirim is distributed unevenly throughout the year, clearly dividing the calendar into distinct wet and dry seasons. Since the city is located in Brazil's tropical climate zone, you won't see any snow here — only warm rain. Rainfall patterns change from frequent and heavy downpours at the beginning of the year to rare, brief showers mid-year.

The wettest period lasts from November to April, peaking in the early months of the year. During this time, rain falls almost daily, so travelers should definitely bring a raincoat. March is the record-holder for rain frequency, with an average of about 28 rainy days. January, February, and December aren't far behind — it rains 26–27 days during these months.

The dry season arrives in June and lasts until August, offering tourists the most stable weather for sightseeing. During this period, precipitation drops sharply. July is considered the driest month of the year, with statistics recording only one rainy day. By September, the number of wet days begins to gradually increase, marking the transition to the next rainy season.

A trip to Guajará-Mirim requires preparation for the hot tropical climate typical of this region of Brazil. In any season, your wardrobe should be based on light, loose clothing made from natural, breathable fabrics like cotton or linen. Since the average daytime temperature stays steadily around +30°C and can reach +34°C in September, opt for light-colored T-shirts, shorts, and lightweight trousers. Be sure to bring comfortable closed-toe shoes for long walks and sandals for relaxing, as well as a hat and sunscreen with a high SPF to protect against the strong sun.

When packing, it's important to consider seasonal rainfall. If you're planning a trip between December and March, be prepared for frequent rain: the number of rainy days in these months reaches 27–28. During this time, a high-quality raincoat or waterproof poncho, along with quick-drying clothes and shoes, will be indispensable. During the dry season (June to August), when there is almost no rain, the air becomes drier, and nights can be slightly cooler (around +20°C), so a light sweater or long-sleeved windbreaker will be useful for evening walks and protection from insects.