S
M
T
W
T
F
S
30
73°
63°
31
80°
65°
1
81°
62°
2
80°
57°
3
79°
57°
4
74°
56°
5
75°
57°
6
75°
58°
7
74°
56°
8
76°
57°
9
73°
59°
10
74°
49°
11
70°
54°
12
72°
54°
13
73°
53°
14
73°
54°
15
72°
54°
16
73°
53°
17
68°
53°
18
73°
54°
19
69°
54°
20
71°
53°
21
71°
54°
22
72°
54°
23
72°
51°
24
66°
50°
25
60°
48°
26
63°
49°
27
67°
49°
28
68°
50°
29
69°
50°
30
69°
49°
1
68°
49°
2
68°
50°
3
66°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Jacobs
St. Jacobs's September 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 48° and 65°. The average high for September is 72° with an average low of 54°. 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. Jacobs. See also: October | November | December.
