S
M
T
W
T
F
S
30
79°
43°
31
77°
41°
1
76°
42°
2
76°
43°
3
80°
45°
4
81°
47°
5
82°
46°
6
82°
46°
7
81°
47°
8
82°
47°
9
82°
46°
10
75°
46°
11
73°
47°
12
79°
46°
13
80°
48°
14
81°
46°
15
80°
45°
16
78°
44°
17
76°
45°
18
78°
45°
19
79°
42°
20
73°
36°
21
80°
45°
22
79°
46°
23
Hist. Avg.
79°
53°
24
Hist. Avg.
79°
53°
25
Hist. Avg.
79°
53°
26
Hist. Avg.
78°
52°
27
Hist. Avg.
78°
52°
28
Hist. Avg.
78°
52°
29
Hist. Avg.
77°
52°
30
Hist. Avg.
77°
51°
1
Hist. Avg.
77°
51°
2
Hist. Avg.
76°
51°
3
Hist. Avg.
76°
51°
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 73° to 82°, with overnight lows between 36° and 48°. The average high for September is 79° with an average low of 45°. 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.
