S
M
T
W
T
F
S
30
92°
73°
31
93°
74°
1
93°
74°
2
92°
73°
3
92°
74°
4
93°
73°
5
92°
73°
6
92°
72°
7
91°
69°
8
87°
69°
9
88°
70°
10
91°
71°
11
90°
69°
12
90°
71°
13
89°
70°
14
90°
71°
15
89°
70°
16
89°
70°
17
90°
67°
18
89°
70°
19
85°
70°
20
88°
65°
21
85°
65°
22
83°
66°
23
83°
67°
24
84°
68°
25
84°
69°
26
87°
68°
27
88°
68°
28
87°
67°
29
86°
67°
30
84°
65°
1
85°
66°
2
86°
61°
3
82°
62°
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 82° to 93°, with overnight lows between 61° and 74°. The average high for September is 88° with an average low of 69°. 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.
