In September, San Isidro typically sees daytime highs of 20.1°C and overnight lows around 14.4°C. Compared to the annual average high of 22.9°C, September runs -2.8°C.
September in San Isidro averages a daytime high of 20.1°C and an overnight low of 14.4°C.
September runs -2.8°C compared to San Isidro's annual average high of 22.9°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 20.1°C and cooler evenings around 14.4°C.