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