In December, Cardiff typically sees daytime highs of 8.5°C and overnight lows around 3.1°C. Compared to the annual average high of 13.4°C, December runs -4.9°C.
December in Cardiff averages a daytime high of 8.5°C and an overnight low of 3.1°C.
December runs -4.9°C compared to Cardiff's annual average high of 13.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 8.5°C and cooler evenings around 3.1°C.