S
M
T
W
T
F
S
30
83°
65°
31
90°
65°
1
92°
69°
2
95°
71°
3
97°
71°
4
96°
72°
5
96°
68°
6
81°
67°
7
N/A
8
85°
59°
9
87°
64°
10
91°
68°
11
89°
69°
12
84°
66°
13
88°
67°
14
89°
67°
15
90°
68°
16
89°
62°
17
80°
63°
18
82°
59°
19
81°
58°
20
80°
56°
21
79°
58°
22
85°
63°
23
84°
62°
24
82°
62°
25
83°
61°
26
84°
62°
27
85°
62°
28
84°
61°
29
83°
61°
30
83°
60°
1
82°
60°
2
81°
59°
3
82°
58°
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 79° to 91°, with overnight lows between 56° and 69°. The average high for September is 84° with an average low of 62°. 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.
