S
M
T
W
T
F
S
30
91°
73°
31
92°
75°
1
90°
74°
2
90°
69°
3
91°
68°
4
87°
68°
5
88°
69°
6
89°
73°
7
92°
76°
8
96°
76°
9
96°
75°
10
95°
74°
11
93°
74°
12
89°
75°
13
93°
69°
14
93°
66°
15
87°
66°
16
89°
67°
17
88°
66°
18
89°
67°
19
88°
66°
20
90°
69°
21
92°
69°
22
88°
71°
23
86°
71°
24
87°
70°
25
84°
70°
26
85°
69°
27
88°
67°
28
89°
69°
29
89°
69°
30
88°
68°
1
89°
67°
2
89°
61°
3
88°
61°
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 84° to 96°, with overnight lows between 61° and 76°. The average high for September is 90° with an average low of 70°. 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.
