S
M
T
W
T
F
S
30
85°
64°
31
81°
57°
1
76°
57°
2
75°
56°
3
76°
56°
4
81°
64°
5
83°
63°
6
80°
64°
7
80°
62°
8
80°
61°
9
81°
63°
10
80°
61°
11
83°
63°
12
82°
62°
13
81°
63°
14
81°
56°
15
82°
50°
16
72°
50°
17
71°
49°
18
71°
51°
19
72°
58°
20
72°
59°
21
70°
57°
22
70°
53°
23
76°
57°
24
78°
57°
25
79°
56°
26
78°
58°
27
77°
54°
28
77°
46°
29
73°
47°
30
65°
50°
1
64°
48°
2
65°
54°
3
64°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Saint Thomas
Saint Thomas's September 2026 forecast shows daily high temperatures ranging from 64° to 85°, with overnight lows between 46° and 64°. The average high for September is 76° with an average low of 56°. 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.
