Average data for 10 years
1 December
Sunday
+9°
+7°
2 December
Monday
+8°
+6°
3 December
Tuesday
+8°
+5°
4 December
Wednesday
+9°
+5°
5 December
Thursday
+10°
+6°
6 December
Friday
+10°
+7°
7 December
Saturday
+10°
+7°
8 December
Sunday
+9°
+6°
9 December
Monday
+9°
+4°
10 December
Tuesday
+9°
+5°
11 December
Wednesday
+9°
+7°
12 December
Thursday
+8°
+5°
13 December
Friday
+8°
+5°
14 December
Saturday
+8°
+6°
15 December
Sunday
+9°
+5°
16 December
Monday
+8°
+5°
17 December
Tuesday
+7°
+5°
18 December
Wednesday
+6°
+3°
19 December
Thursday
+7°
+3°
20 December
Friday
+8°
+4°
21 December
Saturday
+9°
+6°
22 December
Sunday
+9°
+7°
23 December
Monday
+9°
+7°
24 December
Tuesday
+10°
+8°
25 December
Wednesday
+8°
+7°
26 December
Thursday
+8°
+5°
27 December
Friday
+7°
+5°
28 December
Saturday
+7°
+4°
29 December
Sunday
+7°
+5°
30 December
Monday
+7°
+3°
31 December
Tuesday
+7°
+3°
In December, the weather in Siena is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Siena has 12 rainy, 11 sunny, and 8 partly cloudy days in December. The rains are usually moderate. December as well as January, February, March, and November is considered the most uncomfortable time to visit Siena.