S
M
T
W
T
F
S
30
83°
65°
31
90°
65°
1
92°
69°
2
95°
71°
3
97°
71°
4
96°
72°
5
96°
68°
6
81°
67°
7
83°
60°
8
84°
59°
9
88°
60°
10
93°
66°
11
94°
67°
12
88°
70°
13
90°
65°
14
92°
67°
15
84°
58°
16
85°
58°
17
88°
60°
18
90°
64°
19
91°
66°
20
87°
63°
21
80°
58°
22
76°
56°
23
80°
55°
24
78°
54°
25
78°
57°
26
79°
56°
27
81°
59°
28
82°
58°
29
82°
58°
30
81°
59°
1
79°
55°
2
81°
59°
3
83°
59°
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 76° to 92°, with overnight lows between 54° and 70°. The average high for September is 83° with an average low of 60°. 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.
