S
M
T
W
T
F
S
30
77°
58°
31
78°
60°
1
80°
53°
2
80°
50°
3
75°
49°
4
74°
50°
5
74°
51°
6
76°
55°
7
83°
59°
8
84°
59°
9
83°
52°
10
75°
52°
11
76°
58°
12
77°
54°
13
82°
49°
14
74°
47°
15
72°
47°
16
73°
53°
17
76°
55°
18
80°
45°
19
72°
54°
20
75°
51°
21
77°
54°
22
75°
54°
23
80°
55°
24
78°
54°
25
79°
55°
26
78°
54°
27
79°
53°
28
79°
53°
29
78°
52°
30
78°
53°
1
77°
48°
2
78°
42°
3
76°
42°
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 72° to 84°, with overnight lows between 42° and 60°. The average high for September is 77° with an average low of 52°. 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.
