S
M
T
W
T
F
S
30
79°
62°
31
77°
68°
1
78°
66°
2
75°
65°
3
84°
71°
4
85°
65°
5
79°
63°
6
76°
60°
7
78°
63°
8
80°
63°
9
77°
70°
10
83°
66°
11
77°
59°
12
75°
62°
13
76°
63°
14
79°
64°
15
80°
65°
16
81°
58°
17
74°
57°
18
69°
54°
19
76°
60°
20
76°
59°
21
72°
57°
22
71°
57°
23
71°
60°
24
74°
58°
25
71°
56°
26
73°
60°
27
74°
59°
28
73°
54°
29
65°
52°
30
66°
53°
1
65°
50°
2
64°
53°
3
63°
55°
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 63° to 85°, with overnight lows between 50° and 71°. The average high for September is 74° with an average low of 60°. 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.
