S
M
T
W
T
F
S
30
83°
68°
31
86°
68°
1
84°
70°
2
86°
72°
3
80°
67°
4
87°
68°
5
76°
65°
6
73°
61°
7
75°
59°
8
79°
70°
9
82°
64°
10
78°
55°
11
76°
65°
12
82°
62°
13
70°
66°
14
73°
67°
15
69°
59°
16
66°
58°
17
70°
59°
18
65°
54°
19
67°
55°
20
65°
56°
21
68°
54°
22
66°
59°
23
68°
58°
24
72°
59°
25
73°
59°
26
72°
58°
27
71°
59°
28
73°
59°
29
73°
58°
30
72°
58°
1
69°
52°
2
64°
48°
3
58°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Pleasant
Mount Pleasant's September 2026 forecast shows daily high temperatures ranging from 58° to 82°, with overnight lows between 45° and 70°. The average high for September is 71° with an average low of 58°. 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 Mount Pleasant. See also: October | November | December.
