S
M
T
W
T
F
S
30
77°
54°
31
78°
51°
1
79°
47°
2
82°
53°
3
82°
54°
4
84°
50°
5
85°
52°
6
79°
51°
7
80°
52°
8
83°
46°
9
85°
46°
10
87°
44°
11
86°
53°
12
88°
53°
13
85°
54°
14
80°
54°
15
82°
58°
16
81°
54°
17
80°
51°
18
74°
45°
19
75°
44°
20
75°
43°
21
74°
45°
22
69°
45°
23
72°
44°
24
71°
44°
25
73°
42°
26
70°
38°
27
70°
42°
28
66°
33°
29
61°
30°
30
63°
35°
1
67°
34°
2
71°
40°
3
66°
31°
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 61° to 85°, with overnight lows between 30° and 58°. The average high for September is 73° with an average low of 43°. 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.
