S
M
T
W
T
F
S
30
82°
60°
31
78°
61°
1
80°
61°
2
84°
56°
3
83°
51°
4
75°
52°
5
75°
60°
6
81°
55°
7
80°
51°
8
74°
53°
9
73°
55°
10
74°
58°
11
77°
57°
12
82°
58°
13
81°
57°
14
81°
52°
15
80°
50°
16
71°
51°
17
72°
47°
18
72°
47°
19
71°
44°
20
69°
44°
21
68°
45°
22
69°
52°
23
70°
45°
24
72°
51°
25
74°
53°
26
71°
52°
27
76°
53°
28
76°
49°
29
75°
47°
30
68°
47°
1
69°
48°
2
74°
49°
3
67°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Johnsburg
Johnsburg's September 2026 forecast shows daily high temperatures ranging from 67° to 84°, with overnight lows between 40° and 61°. The average high for September is 75° with an average low of 52°. 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 Johnsburg. See also: October | November | December.
