S
M
T
W
T
F
S
30
72°
64°
31
81°
65°
1
86°
61°
2
76°
60°
3
77°
59°
4
70°
63°
5
77°
54°
6
77°
50°
7
78°
52°
8
73°
67°
9
78°
55°
10
69°
48°
11
76°
62°
12
76°
52°
13
69°
50°
14
68°
60°
15
67°
52°
16
66°
55°
17
67°
52°
18
67°
50°
19
63°
49°
20
64°
50°
21
64°
49°
22
66°
56°
23
68°
57°
24
68°
57°
25
69°
56°
26
65°
56°
27
67°
55°
28
68°
57°
29
68°
57°
30
67°
56°
1
67°
54°
2
66°
52°
3
56°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. James
St. James's September 2026 forecast shows daily high temperatures ranging from 56° to 78°, with overnight lows between 48° and 67°. The average high for September is 68° 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. James. See also: October | November | December.
