S
M
T
W
T
F
S
30
82°
61°
31
83°
57°
1
82°
55°
2
79°
58°
3
81°
52°
4
75°
53°
5
81°
57°
6
81°
58°
7
80°
50°
8
73°
49°
9
73°
57°
10
72°
56°
11
76°
55°
12
79°
58°
13
79°
55°
14
78°
58°
15
78°
57°
16
69°
51°
17
70°
53°
18
Hist. Avg.
72°
48°
19
Hist. Avg.
71°
48°
20
Hist. Avg.
71°
47°
21
Hist. Avg.
70°
47°
22
Hist. Avg.
70°
46°
23
Hist. Avg.
70°
46°
24
Hist. Avg.
69°
45°
25
Hist. Avg.
69°
45°
26
Hist. Avg.
68°
44°
27
Hist. Avg.
68°
44°
28
Hist. Avg.
67°
43°
29
Hist. Avg.
67°
43°
30
Hist. Avg.
67°
42°
1
Hist. Avg.
66°
42°
2
Hist. Avg.
66°
41°
3
Hist. Avg.
65°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St. James
St. James's September 2026 forecast shows daily high temperatures ranging from 69° to 83°, with overnight lows between 49° and 61°. The average high for September is 77° with an average low of 55°. 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.
