S
M
T
W
T
F
S
30
72°
63°
31
80°
57°
1
77°
54°
2
78°
47°
3
82°
48°
4
70°
56°
5
72°
58°
6
82°
59°
7
80°
66°
8
79°
53°
9
70°
44°
10
78°
59°
11
80°
50°
12
65°
43°
13
60°
44°
14
58°
47°
15
60°
42°
16
63°
46°
17
59°
42°
18
60°
42°
19
62°
43°
20
64°
43°
21
62°
42°
22
64°
49°
23
67°
48°
24
68°
48°
25
63°
47°
26
64°
47°
27
63°
49°
28
64°
47°
29
65°
46°
30
57°
45°
1
53°
42°
2
51°
38°
3
51°
37°
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 51° to 80°, with overnight lows between 37° and 59°. The average high for September is 63° with an average low of 46°. 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.
