S
M
T
W
T
F
S
30
75°
53°
31
78°
54°
1
78°
51°
2
75°
43°
3
66°
51°
4
70°
52°
5
65°
45°
6
68°
41°
7
65°
41°
8
65°
42°
9
64°
49°
10
68°
50°
11
71°
51°
12
69°
43°
13
69°
40°
14
61°
39°
15
59°
39°
16
60°
38°
17
62°
42°
18
67°
37°
19
59°
35°
20
56°
39°
21
58°
48°
22
64°
42°
23
65°
43°
24
63°
47°
25
65°
47°
26
64°
41°
27
65°
36°
28
56°
35°
29
53°
40°
30
52°
41°
1
54°
38°
2
55°
45°
3
52°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Big Falls
Big Falls's September 2026 forecast shows daily high temperatures ranging from 52° to 78°, with overnight lows between 30° and 54°. The average high for September is 64° with an average low of 43°. 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 Big Falls. See also: October | November | December.
