S
M
T
W
T
F
S
30
79°
57°
31
78°
58°
1
78°
62°
2
79°
65°
3
81°
65°
4
86°
64°
5
86°
63°
6
83°
57°
7
81°
57°
8
79°
56°
9
78°
55°
10
76°
55°
11
76°
56°
12
77°
56°
13
79°
60°
14
81°
61°
15
79°
58°
16
76°
56°
17
75°
57°
18
76°
59°
19
77°
52°
20
77°
56°
21
75°
52°
22
79°
51°
23
73°
50°
24
73°
50°
25
72°
55°
26
72°
50°
27
74°
55°
28
73°
55°
29
73°
47°
30
71°
50°
1
70°
55°
2
76°
53°
3
75°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Highland Park
Highland Park's September 2026 forecast shows daily high temperatures ranging from 70° to 86°, with overnight lows between 47° and 65°. The average high for September is 77° with an average low of 56°. 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 Highland Park. See also: October | November | December.
