In September, San Martin typically sees daytime highs of 22.5°C and overnight lows around 7.4°C. Compared to the annual average high of 24.9°C, September runs -2.4°C.
September in San Martin averages a daytime high of 22.5°C and an overnight low of 7.4°C.
September runs -2.4°C compared to San Martin's annual average high of 24.9°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 22.5°C and cooler evenings around 7.4°C.