In December, San Luis typically sees daytime highs of 28.7°C and overnight lows around 18.8°C. Compared to the annual average high of 30.3°C, December runs -1.6°C.
December in San Luis averages a daytime high of 28.7°C and an overnight low of 18.8°C.
December runs -1.6°C compared to San Luis's annual average high of 30.3°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 28.7°C and cooler evenings around 18.8°C.