S
M
T
W
T
F
S
30
89°
67°
31
88°
68°
1
87°
66°
2
86°
64°
3
86°
67°
4
85°
63°
5
85°
66°
6
87°
65°
7
86°
66°
8
85°
67°
9
85°
65°
10
84°
65°
11
84°
64°
12
82°
64°
13
79°
63°
14
78°
64°
15
79°
64°
16
79°
62°
17
80°
59°
18
79°
58°
19
78°
61°
20
78°
56°
21
76°
55°
22
77°
55°
23
78°
56°
24
79°
60°
25
80°
61°
26
79°
60°
27
80°
60°
28
75°
56°
29
79°
53°
30
76°
53°
1
Hist. Avg.
78°
57°
2
Hist. Avg.
78°
57°
3
Hist. Avg.
78°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alpharetta
Alpharetta's September 2026 forecast shows daily high temperatures ranging from 75° to 89°, with overnight lows between 53° and 68°. The average high for September is 82° with an average low of 62°. 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 Alpharetta. See also: October | November | December.
