S
M
T
W
T
F
S
30
84°
75°
31
84°
75°
1
89°
76°
2
91°
75°
3
90°
75°
4
90°
77°
5
91°
77°
6
93°
75°
7
80°
74°
8
85°
75°
9
85°
74°
10
87°
76°
11
87°
75°
12
87°
76°
13
85°
77°
14
87°
76°
15
85°
72°
16
83°
71°
17
84°
71°
18
85°
72°
19
83°
70°
20
84°
75°
21
85°
75°
22
84°
74°
23
84°
74°
24
83°
73°
25
84°
74°
26
84°
74°
27
85°
73°
28
84°
74°
29
83°
74°
30
83°
73°
1
82°
73°
2
82°
72°
3
83°
72°
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 80° to 93°, with overnight lows between 70° and 77°. The average high for September is 85° with an average low of 74°. 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.
