S
M
T
W
T
F
S
30
84°
65°
31
85°
66°
1
85°
65°
2
86°
69°
3
88°
68°
4
88°
65°
5
87°
69°
6
85°
68°
7
83°
66°
8
87°
66°
9
86°
67°
10
87°
65°
11
85°
66°
12
84°
65°
13
85°
65°
14
84°
64°
15
85°
65°
16
85°
65°
17
84°
66°
18
Hist. Avg.
83°
63°
19
Hist. Avg.
82°
63°
20
Hist. Avg.
82°
62°
21
Hist. Avg.
82°
62°
22
Hist. Avg.
82°
62°
23
Hist. Avg.
81°
61°
24
Hist. Avg.
81°
61°
25
Hist. Avg.
81°
60°
26
Hist. Avg.
80°
60°
27
Hist. Avg.
80°
60°
28
Hist. Avg.
80°
59°
29
Hist. Avg.
80°
59°
30
Hist. Avg.
79°
58°
1
Hist. Avg.
79°
58°
2
Hist. Avg.
79°
57°
3
Hist. Avg.
78°
57°
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 83° to 88°, with overnight lows between 64° and 69°. The average high for September is 85° with an average low of 66°. 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.
