In September, Castanhal typically sees daytime highs of 32.6°C and overnight lows around 21.6°C. Compared to the annual average high of 31.7°C, September runs +1.0°C.
September in Castanhal averages a daytime high of 32.6°C and an overnight low of 21.6°C.
September runs +1.0°C compared to Castanhal's annual average high of 31.7°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 32.6°C and cooler evenings around 21.6°C.