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
95°
71°
7
82°
68°
8
85°
69°
9
85°
70°
10
87°
69°
11
88°
70°
12
87°
67°
13
90°
68°
14
89°
67°
15
87°
69°
16
86°
65°
17
86°
65°
18
87°
66°
19
85°
62°
20
79°
65°
21
86°
66°
22
85°
65°
23
85°
65°
24
84°
64°
25
84°
64°
26
83°
65°
27
85°
65°
28
84°
64°
29
83°
64°
30
83°
63°
1
82°
63°
2
80°
60°
3
75°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Clarkston
Clarkston's September 2026 forecast shows daily high temperatures ranging from 75° to 95°, with overnight lows between 57° and 71°. The average high for September is 85° with an average low of 66°. 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 Clarkston. See also: October | November | December.
