S
M
T
W
T
F
S
30
103°
71°
31
103°
69°
1
104°
68°
2
102°
68°
3
102°
69°
4
101°
68°
5
101°
69°
6
102°
70°
7
102°
70°
8
100°
69°
9
99°
70°
10
100°
70°
11
101°
69°
12
103°
70°
13
104°
71°
14
104°
71°
15
103°
70°
16
101°
71°
17
103°
68°
18
104°
68°
19
104°
70°
20
103°
71°
21
103°
72°
22
104°
71°
23
105°
71°
24
103°
69°
25
97°
67°
26
94°
63°
27
95°
65°
28
94°
66°
29
97°
64°
30
94°
63°
1
92°
62°
2
92°
64°
3
92°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thermal
Thermal's September 2026 forecast shows daily high temperatures ranging from 92° to 105°, with overnight lows between 62° and 72°. The average high for September is 100° with an average low of 68°. 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 Thermal. See also: October | November | December.
