In September, San Rafael typically sees daytime highs of 20.8°C and overnight lows around 4.6°C. Compared to the annual average high of 23.7°C, September runs -2.9°C.
September in San Rafael averages a daytime high of 20.8°C and an overnight low of 4.6°C.
September runs -2.9°C compared to San Rafael's annual average high of 23.7°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 20.8°C and cooler evenings around 4.6°C.