Frequent temperatures in Siena through the whole of December is 5. You can expect highs around 9 with lows about 4. The table below has further info:

MonthDegrees Celsius
High Temperature9
Low Temperature4
Sunshine Per Day4

Siena, Italy Weather in December FAQs

Typically what weather am I expecting?

The usual weather is 5 celsius although it does change during the day

On average whats the weather difference summer vs. winter?

The daily average temperate varies by 7 change in average daily temperature

How cold can it get?

Generally the lows are 4 Click to see more Siena Weather including Siena, Italy November Weather.