S
M
T
W
T
F
S
30
83°
48°
31
84°
49°
1
83°
50°
2
84°
51°
3
83°
48°
4
75°
45°
5
76°
47°
6
77°
48°
7
74°
41°
8
73°
40°
9
73°
47°
10
72°
40°
11
72°
37°
12
70°
42°
13
72°
37°
14
70°
40°
15
71°
39°
16
71°
36°
17
68°
39°
18
69°
38°
19
71°
36°
20
70°
37°
21
72°
40°
22
74°
39°
23
74°
43°
24
66°
34°
25
Hist. Avg.
73°
44°
26
Hist. Avg.
73°
44°
27
Hist. Avg.
72°
43°
28
Hist. Avg.
72°
43°
29
Hist. Avg.
72°
42°
30
Hist. Avg.
71°
42°
1
Hist. Avg.
71°
42°
2
Hist. Avg.
70°
41°
3
Hist. Avg.
70°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mount Pleasant
Mount Pleasant's September 2026 forecast shows daily high temperatures ranging from 66° to 84°, with overnight lows between 34° and 51°. The average high for September is 74° with an average low of 42°. 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.
