S
M
T
W
T
F
S
30
62°
47°
31
66°
47°
1
75°
48°
2
74°
50°
3
63°
52°
4
63°
46°
5
66°
37°
6
69°
41°
7
73°
45°
8
76°
49°
9
68°
51°
10
54°
47°
11
50°
38°
12
62°
31°
13
66°
37°
14
58°
42°
15
60°
36°
16
70°
33°
17
68°
49°
18
70°
38°
19
71°
44°
20
71°
49°
21
66°
45°
22
64°
41°
23
59°
37°
24
58°
37°
25
50°
36°
26
53°
39°
27
58°
34°
28
52°
32°
29
50°
32°
30
43°
30°
1
44°
29°
2
49°
31°
3
51°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort St John
Fort St John's September 2026 forecast shows daily high temperatures ranging from 43° to 71°, with overnight lows between 29° and 49°. The average high for September is 55° with an average low of 36°. 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 Fort St John. See also: October | November | December.
