S
M
T
W
T
F
S
30
101°
79°
31
98°
75°
1
98°
74°
2
97°
72°
3
96°
72°
4
98°
75°
5
99°
75°
6
98°
73°
7
97°
72°
8
97°
75°
9
95°
72°
10
91°
70°
11
92°
68°
12
92°
71°
13
93°
72°
14
91°
72°
15
90°
68°
16
89°
64°
17
87°
64°
18
88°
65°
19
88°
65°
20
89°
67°
21
87°
65°
22
88°
64°
23
89°
68°
24
91°
66°
25
94°
65°
26
93°
70°
27
92°
66°
28
92°
66°
29
93°
70°
30
95°
68°
1
93°
66°
2
93°
66°
3
92°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Summerlin South
Summerlin South's September 2026 forecast shows daily high temperatures ranging from 87° to 101°, with overnight lows between 64° and 79°. The average high for September is 93° with an average low of 69°. 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 Summerlin South. See also: October | November | December.
