S
M
T
W
T
F
S
30
86°
67°
31
88°
65°
1
83°
62°
2
84°
66°
3
89°
63°
4
89°
67°
5
88°
67°
6
87°
66°
7
88°
61°
8
82°
60°
9
83°
59°
10
83°
59°
11
85°
60°
12
86°
59°
13
85°
64°
14
86°
60°
15
85°
64°
16
86°
63°
17
85°
56°
18
80°
56°
19
77°
57°
20
77°
62°
21
79°
59°
22
80°
57°
23
79°
60°
24
78°
60°
25
78°
59°
26
80°
60°
27
83°
59°
28
82°
58°
29
78°
57°
30
77°
58°
1
76°
59°
2
78°
54°
3
77°
50°
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 76° to 89°, with overnight lows between 50° and 67°. The average high for September is 82° with an average low of 60°. 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.
