Rondônia Weather Forecast: New Year's Day 2026

The weather conditions for the first day of the year in Rondônia reflect the typical patterns of the Amazonian summer season. The Centro Gestor e Operacional do Sistema de Proteção da Amazônia (Censipam) indicates that the climate will be unstable, characterized by a mix of sun and clouds. This variability is expected to persist across practically the entire state.

Despite the potential for rain, the day will be dominated by high temperatures and significant moisture content in the air. The combination of heat and humidity is a defining feature of the region's summer climate. Residents should be aware that the sensação de abafamento (mugginess) will be a constant factor throughout the day due to the high relative humidity levels.

The day is expected to start with relatively clear skies. Sunshine is predicted to appear between clouds during the morning hours, offering a window for outdoor activities early in the day. However, conditions are expected to change as the day progresses.

As the afternoon approaches and continues into the early night, the forecast predicts pancadas de chuva (rain showers) in various regions. These showers are likely to be accompanied by isolated thunderstorms. The weather pattern suggests that the rain will be rapid and intermittent rather than continuous downpours.

Wind conditions will remain calm throughout the day. The winds are expected to be weak, blowing primarily from the east and southeast directions. This light airflow will do little to alleviate the high humidity levels affecting the state.

Temperatures across Rondônia will vary, with some areas experiencing higher highs than others. The Centro Gestor e Operacional do Sistema de Proteção da Amazônia (Censipam) has provided specific data points for several key municipalities in the state.

The capital city, Porto Velho, is forecast to have a minimum temperature of 24°C and a maximum of 30°C. Moving inland, Ji-Paraná is expected to be warmer, with a minimum of 23°C and a maximum of 33°C. Similarly, Cacoal will see temperatures ranging from a low of 23°C to a high of 32°C.

In the western part of the state, Vilhena is predicted to have the lowest temperatures in this forecast, ranging from 21°C to 29°C. Meanwhile, Guajará-Mirim will experience temperatures between 24°C and 31°C. Finally, Ariquemes is expected to reach a maximum of 30°C, with a minimum of 23°C.

In summary, the first day of 2026 in Rondônia will be defined by the characteristics of the Amazonian summer. The combination of intense heat, elevated humidity, and intermittent rain showers creates a typical holiday atmosphere for the region. Those intending to celebrate the New Year outdoors should remain vigilant regarding the changing weather conditions, particularly in the afternoon and evening.

While the rain may be brief, the high humidity levels will persist, making the environment feel oppressive. By preparing for both sun and rain, residents and visitors can navigate the day comfortably. The forecast serves as a reminder of the dynamic weather patterns that define the climate in this part of Brazil.