In August, San Sebastian typically sees daytime highs of 23.2°C and overnight lows around 15.9°C. Compared to the annual average high of 17.1°C, August runs +6.1°C.
August in San Sebastian averages a daytime high of 23.2°C and an overnight low of 15.9°C.
August runs +6.1°C compared to San Sebastian's annual average high of 17.1°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 23.2°C and cooler evenings around 15.9°C.