In September, Santiago de Compostela typically sees daytime highs of 22.6°C and overnight lows around 11.7°C. Compared to the annual average high of 17.4°C, September runs +5.2°C.
September in Santiago de Compostela averages a daytime high of 22.6°C and an overnight low of 11.7°C.
September runs +5.2°C compared to Santiago de Compostela's annual average high of 17.4°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 22.6°C and cooler evenings around 11.7°C.