In September, Porto Velho typically sees daytime highs of 33.2°C and overnight lows around 22.0°C. Compared to the annual average high of 31.2°C, September runs +2.0°C.
September in Porto Velho averages a daytime high of 33.2°C and an overnight low of 22.0°C.
September runs +2.0°C compared to Porto Velho's annual average high of 31.2°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 33.2°C and cooler evenings around 22.0°C.