S
M
T
W
T
F
S
30
76°
56°
31
79°
63°
1
75°
51°
2
75°
51°
3
78°
59°
4
78°
58°
5
79°
61°
6
78°
57°
7
72°
55°
8
71°
50°
9
69°
49°
10
70°
49°
11
68°
46°
12
67°
44°
13
64°
41°
14
62°
50°
15
72°
49°
16
71°
48°
17
71°
49°
18
70°
49°
19
70°
48°
20
71°
48°
21
71°
47°
22
70°
47°
23
69°
46°
24
70°
49°
25
71°
48°
26
69°
48°
27
70°
47°
28
69°
46°
29
67°
45°
30
66°
46°
1
67°
46°
2
67°
44°
3
65°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in International Falls
International Falls's September 2026 forecast shows daily high temperatures ranging from 62° to 79°, with overnight lows between 41° and 61°. The average high for September is 70° with an average low of 49°. 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 International Falls. See also: October | November | December.
