S
M
T
W
T
F
S
30
75°
65°
31
84°
63°
1
80°
58°
2
79°
51°
3
81°
60°
4
81°
58°
5
85°
61°
6
84°
63°
7
79°
64°
8
82°
61°
9
72°
54°
10
83°
51°
11
76°
56°
12
62°
45°
13
63°
42°
14
60°
50°
15
66°
42°
16
66°
48°
17
67°
51°
18
72°
54°
19
68°
52°
20
71°
50°
21
69°
50°
22
71°
52°
23
72°
52°
24
71°
51°
25
73°
52°
26
69°
50°
27
70°
51°
28
57°
47°
29
66°
47°
30
66°
46°
1
67°
46°
2
63°
47°
3
66°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Hilaire
St. Hilaire's September 2026 forecast shows daily high temperatures ranging from 57° to 73°, with overnight lows between 42° and 54°. The average high for September is 68° with an average low of 49°. 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 St. Hilaire. See also: October | November | December.
