S
M
T
W
T
F
S
30
88°
71°
31
91°
70°
1
96°
71°
2
98°
73°
3
96°
72°
4
97°
73°
5
95°
69°
6
95°
68°
7
87°
70°
8
89°
67°
9
92°
68°
10
93°
67°
11
92°
65°
12
87°
64°
13
88°
62°
14
87°
63°
15
86°
66°
16
80°
66°
17
80°
65°
18
82°
66°
19
81°
65°
20
79°
62°
21
80°
59°
22
81°
58°
23
80°
58°
24
84°
64°
25
85°
64°
26
79°
63°
27
76°
64°
28
76°
63°
29
77°
62°
30
80°
62°
1
76°
61°
2
76°
60°
3
77°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Clemson
Clemson's September 2026 forecast shows daily high temperatures ranging from 76° to 98°, with overnight lows between 58° and 73°. 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 Clemson. See also: October | November | December.
