S
M
T
W
T
F
S
30
88°
74°
31
87°
73°
1
87°
74°
2
88°
73°
3
86°
72°
4
84°
73°
5
84°
72°
6
87°
75°
7
87°
76°
8
86°
75°
9
86°
75°
10
87°
74°
11
87°
75°
12
86°
75°
13
86°
74°
14
85°
74°
15
85°
73°
16
84°
73°
17
85°
70°
18
85°
72°
19
83°
72°
20
84°
71°
21
85°
72°
22
81°
71°
23
84°
71°
24
83°
72°
25
83°
71°
26
84°
68°
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 81° to 88°, with overnight lows between 68° and 76°. The average high for September is 85° with an average low of 73°. 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.
