Average data for 10 years
1 September
Sunday
+26°
+20°
2 September
Monday
+26°
+19°
3 September
Tuesday
+26°
+19°
4 September
Wednesday
+26°
+19°
5 September
Thursday
+26°
+18°
6 September
Friday
+26°
+18°
7 September
Saturday
+25°
+17°
8 September
Sunday
+25°
+18°
9 September
Monday
+25°
+17°
10 September
Tuesday
+25°
+17°
11 September
Wednesday
+24°
+18°
12 September
Thursday
+24°
+18°
13 September
Friday
+24°
+18°
14 September
Saturday
+22°
+17°
15 September
Sunday
+22°
+17°
16 September
Monday
+23°
+16°
17 September
Tuesday
+23°
+16°
18 September
Wednesday
+21°
+17°
19 September
Thursday
+21°
+15°
20 September
Friday
+22°
+15°
21 September
Saturday
+23°
+16°
22 September
Sunday
+22°
+15°
23 September
Monday
+21°
+15°
24 September
Tuesday
+22°
+15°
25 September
Wednesday
+22°
+14°
26 September
Thursday
+22°
+15°
27 September
Friday
+22°
+15°
28 September
Saturday
+22°
+14°
29 September
Sunday
+21°
+15°
30 September
Monday
+19°
+15°
Cities with similar weather in September
Bulgaria
Burgas
Montenegro
Tivat
Bulgaria
The Sunny Beach
Serbia
Belgrade
In September, the weather in Siena is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Siena has 20 sunny, 6 rainy, and 4 partly cloudy days in September. The rains are usually moderate. September as well as July and August is considered the most comfortable time to visit Siena.