S
M
T
W
T
F
S
30
87°
82°
31
87°
82°
1
88°
81°
2
87°
82°
3
87°
82°
4
88°
81°
5
88°
82°
6
87°
81°
7
87°
81°
8
88°
82°
9
87°
82°
10
87°
81°
11
86°
81°
12
86°
80°
13
86°
82°
14
87°
81°
15
86°
81°
16
86°
80°
17
87°
82°
18
87°
81°
19
88°
81°
20
88°
80°
21
89°
80°
22
90°
81°
23
89°
79°
24
89°
79°
25
88°
78°
26
89°
78°
27
89°
79°
28
88°
78°
29
89°
79°
30
89°
80°
1
88°
80°
2
89°
79°
3
90°
80°
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 86° to 90°, with overnight lows between 78° and 82°. The average high for September is 88° with an average low of 81°. 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.
