S
M
T
W
T
F
S
30
94°
64°
31
99°
66°
1
100°
71°
2
100°
74°
3
102°
73°
4
99°
73°
5
99°
71°
6
93°
64°
7
91°
64°
8
95°
70°
9
94°
71°
10
92°
65°
11
87°
61°
12
81°
60°
13
85°
62°
14
88°
62°
15
85°
60°
16
80°
56°
17
83°
61°
18
78°
57°
19
78°
60°
20
82°
59°
21
82°
60°
22
79°
59°
23
80°
55°
24
79°
58°
25
78°
58°
26
78°
52°
27
70°
47°
28
70°
46°
29
68°
46°
30
72°
47°
1
69°
49°
2
73°
53°
3
67°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Jacob
St. Jacob's September 2026 forecast shows daily high temperatures ranging from 67° to 102°, with overnight lows between 46° and 73°. The average high for September is 82° with an average low of 59°. 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. Jacob. See also: October | November | December.
