S
M
T
W
T
F
S
30
89°
71°
31
88°
72°
1
89°
71°
2
92°
70°
3
89°
68°
4
88°
68°
5
88°
69°
6
89°
69°
7
90°
67°
8
87°
68°
9
91°
69°
10
91°
68°
11
90°
68°
12
92°
69°
13
91°
70°
14
91°
70°
15
90°
69°
16
90°
69°
17
91°
68°
18
89°
69°
19
88°
68°
20
89°
68°
21
88°
67°
22
86°
68°
23
87°
67°
24
85°
67°
25
Hist. Avg.
87°
67°
26
Hist. Avg.
87°
67°
27
Hist. Avg.
87°
67°
28
Hist. Avg.
86°
66°
29
Hist. Avg.
86°
66°
30
Hist. Avg.
86°
66°
1
Hist. Avg.
86°
65°
2
Hist. Avg.
86°
65°
3
Hist. Avg.
85°
64°
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 85° to 92°, with overnight lows between 67° and 72°. The average high for September is 89° with an average low of 69°. 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.
