In December, San Sebastian typically sees daytime highs of 12.1°C and overnight lows around 6.0°C. Compared to the annual average high of 17.1°C, December runs -5.0°C.
December in San Sebastian averages a daytime high of 12.1°C and an overnight low of 6.0°C.
December runs -5.0°C compared to San Sebastian's annual average high of 17.1°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 12.1°C and cooler evenings around 6.0°C.