S
M
T
W
T
F
S
30
102°
71°
31
101°
74°
1
100°
71°
2
95°
73°
3
91°
71°
4
95°
73°
5
96°
72°
6
99°
71°
7
98°
71°
8
95°
73°
9
95°
72°
10
96°
70°
11
93°
71°
12
93°
71°
13
92°
71°
14
91°
68°
15
88°
64°
16
92°
67°
17
92°
68°
18
89°
65°
19
91°
67°
20
91°
67°
21
90°
68°
22
91°
67°
23
91°
67°
24
90°
66°
25
90°
66°
26
89°
64°
27
84°
59°
28
81°
58°
29
79°
54°
30
84°
58°
1
87°
62°
2
87°
58°
3
77°
53°
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 77° to 99°, with overnight lows between 53° and 73°. The average high for September is 90° with an average low of 66°. 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.
