S
M
T
W
T
F
S
31
90°
80°
1
90°
80°
2
91°
81°
3
91°
82°
4
91°
80°
5
94°
82°
6
90°
79°
7
91°
81°
8
91°
82°
9
90°
82°
10
91°
83°
11
90°
82°
12
91°
82°
13
93°
82°
14
92°
84°
15
94°
82°
16
94°
82°
17
92°
81°
18
83°
75°
19
87°
76°
20
89°
80°
21
89°
82°
22
90°
82°
23
92°
81°
24
85°
78°
25
90°
78°
26
89°
81°
27
89°
81°
28
90°
83°
29
90°
82°
30
90°
81°
1
91°
81°
2
92°
80°
3
91°
79°
4
90°
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 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
