S
M
T
W
T
F
S
30
81°
59°
31
79°
58°
1
79°
59°
2
80°
60°
3
78°
63°
4
79°
59°
5
81°
58°
6
80°
59°
7
79°
57°
8
78°
58°
9
78°
57°
10
77°
59°
11
78°
56°
12
77°
56°
13
77°
55°
14
79°
58°
15
79°
61°
16
81°
60°
17
77°
54°
18
75°
53°
19
75°
54°
20
77°
59°
21
75°
53°
22
75°
55°
23
78°
58°
24
79°
59°
25
80°
58°
26
79°
50°
27
78°
51°
28
71°
50°
29
70°
49°
30
70°
49°
1
Hist. Avg.
73°
53°
2
Hist. Avg.
72°
53°
3
Hist. Avg.
72°
52°
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 70° to 81°, with overnight lows between 49° and 63°. The average high for September is 77° with an average low of 56°. 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.
