S
M
T
W
T
F
S
30
97°
69°
31
94°
70°
1
94°
72°
2
97°
73°
3
100°
71°
4
100°
71°
5
96°
72°
6
94°
71°
7
94°
71°
8
93°
72°
9
95°
71°
10
93°
70°
11
101°
69°
12
104°
71°
13
96°
67°
14
96°
67°
15
94°
65°
16
90°
66°
17
89°
63°
18
84°
59°
19
81°
58°
20
81°
56°
21
86°
62°
22
85°
60°
23
82°
59°
24
81°
54°
25
85°
60°
26
83°
60°
27
81°
60°
28
81°
59°
29
84°
58°
30
84°
58°
1
83°
57°
2
83°
57°
3
82°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sundown
Sundown's September 2026 forecast shows daily high temperatures ranging from 81° to 104°, with overnight lows between 54° and 71°. The average high for September is 87° with an average low of 61°. 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 Sundown. See also: October | November | December.
