S
M
T
W
T
F
S
30
91°
64°
31
87°
70°
1
98°
73°
2
85°
72°
3
88°
71°
4
86°
65°
5
80°
60°
6
78°
54°
7
79°
53°
8
84°
50°
9
92°
76°
10
90°
72°
11
87°
69°
12
79°
65°
13
90°
71°
14
81°
57°
15
77°
46°
16
86°
67°
17
83°
69°
18
81°
58°
19
76°
63°
20
75°
60°
21
69°
63°
22
70°
58°
23
68°
59°
24
74°
56°
25
71°
56°
26
72°
53°
27
74°
54°
28
71°
53°
29
72°
51°
30
72°
54°
1
70°
55°
2
71°
56°
3
65°
55°
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 65° to 86°, with overnight lows between 51° and 69°. The average high for September is 73° with an average low of 58°. 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.
