In December, the weather on the Vía Augusta in Southern Spain is usually mild. As you travel through Cádiz and towards Sevilla, you'll mostly see sunny skies with some clouds and occasional light rain.
In Cádiz and nearby towns like Puerto Real, the average high temperatures are about 16-17°C and the lows are between 10-11°C. Rain is possible but usually light, with about 0.8 to 2.8 mm of rain per day. Most days are sunny with some cloudy periods.
When you move towards Sevilla, including areas like Jerez de la Frontera and Alcalá de Guadaíra, temperatures are similar with highs of 16-18°C and lows of 8-10°C. Sunny weather continues, but there is a slightly higher chance of moderate rain, especially near Sevilla, with an average of up to 6.7 mm/day. There may be more clouds, but sunny weather still dominates.
Overall, December is a good time for a trip along the Vía Augusta, with mild temperatures and varied but mostly sunny weather.
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