S
M
T
W
T
F
S
30
87°
70°
31
90°
69°
1
85°
70°
2
85°
72°
3
86°
69°
4
85°
70°
5
88°
72°
6
89°
69°
7
87°
68°
8
84°
69°
9
84°
67°
10
85°
68°
11
85°
68°
12
87°
70°
13
86°
71°
14
86°
66°
15
83°
66°
16
Hist. Avg.
83°
73°
17
Hist. Avg.
82°
72°
18
Hist. Avg.
82°
72°
19
Hist. Avg.
82°
72°
20
Hist. Avg.
82°
72°
21
Hist. Avg.
82°
72°
22
Hist. Avg.
82°
71°
23
Hist. Avg.
81°
71°
24
Hist. Avg.
81°
71°
25
Hist. Avg.
81°
70°
26
Hist. Avg.
81°
70°
27
Hist. Avg.
80°
70°
28
Hist. Avg.
80°
70°
29
Hist. Avg.
80°
69°
30
Hist. Avg.
80°
69°
1
Hist. Avg.
80°
69°
2
Hist. Avg.
79°
68°
3
Hist. Avg.
79°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Johns Island
Johns Island's September 2026 forecast shows daily high temperatures ranging from 83° to 90°, with overnight lows between 66° and 72°. The average high for September is 86° 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 Johns Island. See also: October | November | December.
