S
M
T
W
T
F
S
30
80°
54°
31
83°
48°
1
81°
61°
2
84°
52°
3
84°
54°
4
88°
52°
5
89°
53°
6
89°
52°
7
82°
53°
8
82°
48°
9
82°
42°
10
85°
52°
11
86°
53°
12
76°
43°
13
84°
47°
14
74°
50°
15
71°
40°
16
80°
48°
17
76°
54°
18
72°
50°
19
70°
49°
20
62°
46°
21
70°
46°
22
74°
47°
23
N/A
24
75°
47°
25
77°
48°
26
81°
50°
27
73°
50°
28
65°
46°
29
72°
44°
30
75°
46°
1
71°
47°
2
77°
43°
3
74°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Johnstown
Johnstown's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Johnstown. See also: October | November | December.
