S
M
T
W
T
F
S
30
76°
64°
31
80°
66°
1
82°
66°
2
82°
65°
3
81°
59°
4
81°
58°
5
74°
59°
6
75°
64°
7
75°
64°
8
80°
63°
9
79°
62°
10
77°
63°
11
79°
62°
12
79°
63°
13
78°
63°
14
78°
62°
15
79°
63°
16
79°
59°
17
77°
62°
18
75°
58°
19
76°
55°
20
71°
53°
21
70°
52°
22
69°
59°
23
69°
56°
24
74°
52°
25
68°
51°
26
67°
51°
27
69°
54°
28
73°
57°
29
72°
54°
30
73°
52°
1
67°
55°
2
67°
48°
3
70°
49°
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 67° to 82°, with overnight lows between 48° and 66°. The average high for September is 75° with an average low of 58°. 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.
