Weather in Siena in September 2026
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1 +30° +20°
45% · 6.5 West-North-West
764 mmHg
2 +30° +19°
41% · 6.5 West
764 mmHg
3 +30° +20°
41% · 3.5 North-North-West
764 mmHg
4 +33° +20°
29% · 5.5 West
764 mmHg
5 +31° +20°
41% · 5.5 West-North-West
764 mmHg
6 +31° +20°
42% · 4.5 West
765 mmHg
7 +31° +21°
41% · 5.5 West
766 mmHg
8 +31° +21°
29% · 6.5 West
762 mmHg
9 +28° +21°
54% · 7.5 South-South-West
757 mmHg
10 +21° +19°
86% · 5.5 South
759 mmHg
11 +22° +15°
47% · 4.5 West-North-West
763 mmHg
12 +26° +17°
50% · 5.5 North
765 mmHg
13 +26° +16°
37% · 3.5 East-North-East
767 mmHg
14 +26° +16°
45% · 2.5 East
765 mmHg
15 +28° +16°
30% · 2.5 East
764 mmHg
16 +27° +16°
49% · 3.5 West
761 mmHg
17 +26° +18°
72% · 4.5 South
761 mmHg
18 +23° +17°
80% · 1.5 East
761 mmHg
19 +26° +17°
53% · 1.5 East-South-East
766 mmHg
20 +27° +16°
49% · 2.5 North-West
767 mmHg
21 +27° +17°
59% · 2.5 North-West
767 mmHg
22 +25° +17°
46% · 5.5 East
764 mmHg
23 +23° +14°
40% · 4.5 East
768 mmHg
24 +26° +14°
47% · 4.5 West
767 mmHg
25 +23° +16°
43% · 4.5 East
764 mmHg
26 +24° +12°
41% · 2.5 North-North-West
767 mmHg
27 +28° +12°
32% · 1.5 West-North-West
767 mmHg
28 +25° +13°
40% · 2.5 North-West
767 mmHg
29 +27° +14°
44% · 2.5 West-North-West
767 mmHg
30 +26° +14°
48% · 2.5 West-North-West
768 mmHg
Climate normals by month
average daytime and night-time temperature, Siena
Daytime Night-time
Wind rose for Siena: September
based on the month history over the last 10 years
Prevailing West — 21.1% of periods
Precipitation in Siena: September by year
days with precipitation
September in Siena over the last 10 years
average daytime temperature by year