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