S
M
T
W
T
F
S
30
82°
45°
31
76°
44°
1
73°
50°
2
82°
44°
3
79°
49°
4
76°
49°
5
81°
47°
6
78°
43°
7
80°
44°
8
73°
40°
9
69°
39°
10
67°
39°
11
66°
40°
12
68°
44°
13
69°
40°
14
67°
39°
15
68°
40°
16
66°
38°
17
65°
36°
18
64°
36°
19
64°
37°
20
65°
38°
21
70°
41°
22
72°
39°
23
70°
47°
24
73°
43°
25
64°
36°
26
63°
43°
27
65°
35°
28
61°
34°
29
60°
34°
30
61°
43°
1
60°
46°
2
65°
33°
3
71°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Great Falls North
Great Falls North's September 2026 forecast shows daily high temperatures ranging from 60° to 82°, with overnight lows between 31° and 50°. The average high for September is 70° with an average low of 41°. 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 Great Falls North. See also: October | November | December.
