In September, San Bernardo typically sees daytime highs of 17.6°C and overnight lows around 4.6°C. Compared to the annual average high of 21.0°C, September runs -3.3°C.
September in San Bernardo averages a daytime high of 17.6°C and an overnight low of 4.6°C.
September runs -3.3°C compared to San Bernardo's annual average high of 21.0°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 17.6°C and cooler evenings around 4.6°C.