S
M
T
W
T
F
S
30
89°
67°
31
89°
64°
1
88°
64°
2
82°
61°
3
84°
61°
4
86°
64°
5
87°
63°
6
87°
61°
7
82°
60°
8
82°
63°
9
83°
60°
10
83°
60°
11
84°
61°
12
83°
60°
13
82°
59°
14
80°
58°
15
81°
59°
16
81°
58°
17
83°
62°
18
83°
61°
19
81°
61°
20
83°
61°
21
80°
55°
22
77°
55°
23
Hist. Avg.
82°
58°
24
Hist. Avg.
82°
58°
25
Hist. Avg.
81°
57°
26
Hist. Avg.
81°
57°
27
Hist. Avg.
81°
56°
28
Hist. Avg.
80°
56°
29
Hist. Avg.
80°
55°
30
Hist. Avg.
80°
55°
1
Hist. Avg.
79°
55°
2
Hist. Avg.
79°
54°
3
Hist. Avg.
79°
54°
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 77° to 89°, with overnight lows between 55° and 67°. The average high for September is 83° with an average low of 61°. 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.
