S
M
T
W
T
F
S
30
74°
56°
31
80°
57°
1
82°
59°
2
81°
61°
3
82°
62°
4
81°
53°
5
78°
57°
6
80°
60°
7
75°
58°
8
81°
60°
9
82°
59°
10
82°
59°
11
81°
58°
12
82°
60°
13
80°
58°
14
79°
58°
15
79°
57°
16
76°
58°
17
77°
54°
18
77°
50°
19
73°
47°
20
69°
48°
21
68°
48°
22
71°
45°
23
67°
46°
24
67°
53°
25
65°
54°
26
70°
53°
27
67°
54°
28
67°
55°
29
70°
54°
30
70°
43°
1
68°
41°
2
62°
40°
3
60°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lake Zurich
Lake Zurich's September 2026 forecast shows daily high temperatures ranging from 60° to 82°, with overnight lows between 39° and 62°. The average high for September is 74° with an average low of 54°. 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 Lake Zurich. See also: October | November | December.
