S
M
T
W
T
F
S
30
87°
81°
31
84°
84°
1
88°
79°
2
91°
84°
3
90°
86°
4
N/A
5
90°
82°
6
90°
81°
7
90°
81°
8
91°
82°
9
93°
82°
10
91°
81°
11
89°
79°
12
89°
80°
13
90°
79°
14
90°
79°
15
90°
79°
16
91°
80°
17
88°
81°
18
87°
81°
19
87°
80°
20
88°
81°
21
87°
81°
22
87°
80°
23
88°
81°
24
86°
81°
25
86°
80°
26
87°
81°
27
86°
81°
28
87°
80°
29
86°
81°
30
86°
80°
1
87°
81°
2
87°
81°
3
88°
80°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St Thomas
St Thomas's September 2026 forecast shows daily high temperatures ranging from 86° to 93°, with overnight lows between 79° 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.
