S
M
T
W
T
F
S
30
91°
72°
31
91°
73°
1
92°
73°
2
92°
72°
3
91°
73°
4
92°
73°
5
91°
72°
6
90°
73°
7
90°
68°
8
91°
69°
9
91°
68°
10
90°
69°
11
92°
70°
12
91°
69°
13
92°
70°
14
92°
70°
15
90°
69°
16
87°
69°
17
87°
68°
18
88°
69°
19
85°
68°
20
88°
68°
21
89°
67°
22
87°
67°
23
84°
66°
24
84°
67°
25
85°
66°
26
83°
66°
27
83°
65°
28
84°
66°
29
85°
64°
30
83°
65°
1
82°
64°
2
83°
62°
3
82°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sun
Sun's September 2026 forecast shows daily high temperatures ranging from 82° to 92°, with overnight lows between 62° and 73°. The average high for September is 88° 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 Sun. See also: October | November | December.
