S
M
T
W
T
F
S
30
87°
82°
31
88°
82°
1
87°
81°
2
87°
81°
3
88°
82°
4
89°
80°
5
89°
78°
6
88°
80°
7
89°
80°
8
89°
79°
9
88°
80°
10
88°
80°
11
89°
79°
12
88°
79°
13
87°
80°
14
89°
81°
15
90°
81°
16
90°
80°
17
89°
79°
18
90°
80°
19
89°
79°
20
89°
79°
21
90°
81°
22
89°
79°
23
90°
78°
24
89°
78°
25
89°
79°
26
88°
79°
27
89°
78°
28
89°
78°
29
88°
79°
30
88°
78°
1
89°
79°
2
88°
78°
3
89°
79°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St Thomas
St Thomas's September 2026 forecast shows daily high temperatures ranging from 87° to 90°, with overnight lows between 78° and 82°. The average high for September is 89° with an average low of 80°. 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 Thomas. See also: October | November | December.
