In September, Rio Branco typically sees daytime highs of 33.5°C and overnight lows around 20.8°C. Compared to the annual average high of 31.2°C, September runs +2.2°C.
September in Rio Branco averages a daytime high of 33.5°C and an overnight low of 20.8°C.
September runs +2.2°C compared to Rio Branco's annual average high of 31.2°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 33.5°C and cooler evenings around 20.8°C.