S
M
T
W
T
F
S
30
73°
56°
31
78°
55°
1
78°
56°
2
79°
48°
3
76°
46°
4
70°
53°
5
70°
55°
6
78°
47°
7
73°
45°
8
69°
44°
9
68°
49°
10
70°
53°
11
71°
54°
12
77°
52°
13
75°
47°
14
69°
44°
15
65°
43°
16
65°
46°
17
66°
43°
18
65°
42°
19
68°
39°
20
63°
40°
21
63°
47°
22
64°
46°
23
69°
41°
24
67°
48°
25
69°
49°
26
65°
49°
27
71°
45°
28
71°
40°
29
68°
42°
30
59°
45°
1
64°
43°
2
68°
45°
3
58°
35°
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 58° to 79°, with overnight lows between 35° and 56°. The average high for September is 69° with an average low of 47°. 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.
