S
M
T
W
T
F
S
30
95°
70°
31
N/A
1
97°
74°
2
95°
74°
3
95°
76°
4
97°
75°
5
98°
73°
6
100°
72°
7
100°
72°
8
100°
71°
9
98°
69°
10
95°
69°
11
87°
62°
12
90°
65°
13
90°
66°
14
85°
65°
15
84°
64°
16
88°
64°
17
88°
63°
18
89°
64°
19
89°
64°
20
88°
63°
21
88°
64°
22
87°
63°
23
88°
62°
24
88°
62°
25
87°
61°
26
87°
62°
27
88°
61°
28
88°
62°
29
87°
61°
30
88°
61°
1
87°
60°
2
86°
61°
3
86°
60°
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 84° to 100°, with overnight lows between 60° and 76°. The average high for September is 91° with an average low of 66°. 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.
