S
M
T
W
T
F
S
30
76°
52°
31
75°
49°
1
75°
54°
2
75°
56°
3
82°
61°
4
74°
59°
5
70°
57°
6
74°
51°
7
79°
51°
8
72°
53°
9
70°
53°
10
73°
49°
11
69°
46°
12
75°
45°
13
74°
59°
14
65°
43°
15
64°
39°
16
78°
56°
17
70°
53°
18
68°
42°
19
62°
37°
20
64°
43°
21
61°
44°
22
N/A
23
66°
44°
24
71°
38°
25
75°
44°
26
74°
53°
27
66°
52°
28
56°
48°
29
63°
48°
30
70°
54°
1
71°
57°
2
68°
53°
3
66°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Saint-Thomas
Saint-Thomas's September 2026 forecast shows daily high temperatures ranging from 56° to 74°, with overnight lows between 48° and 57°. The average high for September is 67° with an average low of 52°. 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 Saint-Thomas. See also: October | November | December.
