S
M
T
W
T
F
S
30
91°
70°
31
93°
70°
1
96°
70°
2
98°
72°
3
97°
73°
4
97°
72°
5
100°
72°
6
97°
71°
7
82°
73°
8
88°
67°
9
89°
72°
10
89°
69°
11
88°
71°
12
87°
69°
13
88°
70°
14
89°
69°
15
88°
68°
16
89°
69°
17
83°
65°
18
84°
64°
19
82°
65°
20
83°
62°
21
80°
61°
22
85°
65°
23
84°
65°
24
84°
64°
25
83°
64°
26
84°
63°
27
85°
64°
28
84°
64°
29
83°
63°
30
83°
63°
1
82°
62°
2
82°
60°
3
75°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Stone Mountain
Stone Mountain's September 2026 forecast shows daily high temperatures ranging from 75° to 89°, with overnight lows between 56° and 72°. The average high for September is 85° with an average low of 65°. 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 Stone Mountain. See also: October | November | December.
