S
M
T
W
T
F
S
30
85°
75°
31
84°
74°
1
85°
76°
2
86°
76°
3
85°
72°
4
83°
71°
5
83°
71°
6
84°
72°
7
84°
71°
8
85°
74°
9
87°
76°
10
87°
73°
11
86°
71°
12
87°
72°
13
87°
71°
14
86°
74°
15
86°
74°
16
87°
72°
17
85°
73°
18
85°
73°
19
84°
72°
20
84°
72°
21
83°
73°
22
81°
72°
23
83°
69°
24
81°
71°
25
80°
71°
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 80° to 87°, with overnight lows between 69° 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.
