S
M
T
W
T
F
S
30
83°
65°
31
84°
67°
1
88°
69°
2
89°
69°
3
88°
68°
4
87°
64°
5
83°
63°
6
83°
63°
7
84°
64°
8
83°
67°
9
84°
68°
10
83°
67°
11
87°
66°
12
87°
68°
13
86°
67°
14
87°
67°
15
87°
66°
16
86°
67°
17
86°
67°
18
85°
65°
19
85°
64°
20
84°
59°
21
79°
64°
22
79°
63°
23
80°
62°
24
84°
58°
25
80°
57°
26
78°
62°
27
79°
59°
28
77°
57°
29
81°
60°
30
81°
61°
1
80°
59°
2
80°
59°
3
75°
60°
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 75° to 89°, with overnight lows between 57° and 69°. The average high for September is 83° with an average low of 64°. 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.
