According to Climatempo, the autumn season in Rio de Janeiro will begin on Friday, with forecasts suggesting a mix of warm days and cooler spells. The typical temperature fluctuations are expected to remain within average ranges, with meteorologist Hana Silveira indicating that the light rains will be a common feature throughout the season. Notably, colder temperatures are anticipated to arrive later than usual, especially until mid-April, where summer-like conditions with heat and humidity may dominate the early part of autumn.

The peculiar weather patterns for the autumn of 2026 suggest that rainfall will be more frequent and prolonged compared to historical norms, which may lead to almost daily showers, and potentially heavier rain events. The presence of oceanic cold fronts is expected to help reduce temperatures in the state gradually. Additionally, the occurrence of cold days is also possible when cold air masses manage to push into the Southeastern region, indicating a varied thermic profile that deviates from the norm.

As the first weekend of autumn approaches, residents can expect the transition to bring both warmth and showers, indicative of the season's characteristic instability. This weather trend not only paints a vivid picture of local climatological shifts but also calls attention to the potential challenges such weather may pose for residents, including increased humidity and concerns for those in flood-prone areas.