S
M
T
W
T
F
S
30
92°
69°
31
90°
63°
1
85°
62°
2
90°
63°
3
88°
73°
4
91°
70°
5
84°
70°
6
75°
66°
7
82°
66°
8
88°
64°
9
82°
55°
10
82°
52°
11
85°
54°
12
73°
49°
13
61°
51°
14
74°
54°
15
67°
47°
16
65°
52°
17
69°
47°
18
68°
50°
19
69°
48°
20
73°
51°
21
73°
53°
22
72°
49°
23
72°
51°
24
70°
45°
25
75°
53°
26
75°
52°
27
74°
53°
28
73°
52°
29
70°
51°
30
72°
49°
1
64°
49°
2
71°
48°
3
68°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Heron Lake
Heron Lake's September 2026 forecast shows daily high temperatures ranging from 61° to 85°, with overnight lows between 45° and 54°. The average high for September is 71° with an average low of 50°. 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 Heron Lake. See also: October | November | December.
