S
M
T
W
T
F
S
30
65°
47°
31
67°
48°
1
67°
50°
2
66°
51°
3
65°
52°
4
65°
49°
5
64°
47°
6
65°
47°
7
62°
45°
8
63°
51°
9
64°
47°
10
61°
49°
11
60°
48°
12
61°
49°
13
62°
51°
14
61°
50°
15
62°
50°
16
64°
49°
17
64°
49°
18
63°
50°
19
Hist. Avg.
60°
49°
20
Hist. Avg.
60°
49°
21
Hist. Avg.
60°
49°
22
Hist. Avg.
59°
49°
23
Hist. Avg.
59°
48°
24
Hist. Avg.
59°
48°
25
Hist. Avg.
59°
48°
26
Hist. Avg.
59°
48°
27
Hist. Avg.
58°
48°
28
Hist. Avg.
58°
47°
29
Hist. Avg.
58°
47°
30
Hist. Avg.
58°
47°
1
Hist. Avg.
57°
47°
2
Hist. Avg.
57°
47°
3
Hist. Avg.
57°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Johnstone
Johnstone's September 2026 forecast shows daily high temperatures ranging from 60° to 67°, with overnight lows between 45° and 52°. The average high for September is 64° with an average low of 49°. 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 Johnstone. See also: October | November | December.
