S
M
T
W
T
F
S
30
64°
59°
31
64°
59°
1
66°
57°
2
64°
52°
3
61°
50°
4
59°
46°
5
57°
48°
6
48°
43°
7
55°
39°
8
59°
52°
9
59°
55°
10
59°
52°
11
55°
50°
12
57°
48°
13
57°
45°
14
57°
45°
15
55°
41°
16
N/A
17
57°
48°
18
57°
49°
19
56°
48°
20
58°
45°
21
55°
40°
22
54°
41°
23
55°
43°
24
54°
41°
25
54°
43°
26
52°
42°
27
50°
41°
28
51°
38°
29
52°
42°
30
48°
36°
1
44°
33°
2
44°
37°
3
47°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Iisalmi
Iisalmi's September 2026 forecast shows daily high temperatures ranging from 44° to 58°, with overnight lows between 33° and 49°. The average high for September is 52° with an average low of 42°. 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 Iisalmi. See also: October | November | December.
