S
M
T
W
T
F
S
30
74°
51°
31
75°
49°
1
76°
55°
2
76°
59°
3
80°
63°
4
74°
58°
5
70°
53°
6
73°
55°
7
79°
59°
8
74°
57°
9
68°
63°
10
73°
53°
11
66°
51°
12
72°
59°
13
75°
59°
14
71°
54°
15
67°
53°
16
67°
50°
17
69°
52°
18
67°
54°
19
66°
47°
20
72°
53°
21
60°
51°
22
61°
50°
23
68°
51°
24
70°
50°
25
69°
50°
26
69°
48°
27
62°
45°
28
67°
49°
29
68°
49°
30
69°
51°
1
70°
50°
2
69°
49°
3
66°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Richelieu
Richelieu's September 2026 forecast shows daily high temperatures ranging from 60° to 79°, with overnight lows between 45° and 63°. The average high for September is 69° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Richelieu. See also: October | November | December.
