S
M
T
W
T
F
S
30
81°
59°
31
84°
59°
1
85°
59°
2
86°
57°
3
90°
57°
4
91°
58°
5
90°
60°
6
88°
59°
7
84°
63°
8
81°
61°
9
79°
58°
10
86°
52°
11
86°
57°
12
81°
53°
13
91°
56°
14
87°
62°
15
77°
56°
16
81°
62°
17
79°
58°
18
81°
55°
19
78°
52°
20
72°
49°
21
69°
50°
22
71°
52°
23
73°
53°
24
76°
54°
25
76°
52°
26
77°
53°
27
76°
51°
28
71°
42°
29
73°
47°
30
70°
44°
1
75°
46°
2
74°
46°
3
75°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Highlands Ranch
Highlands Ranch's September 2026 forecast shows daily high temperatures ranging from 69° to 81°, with overnight lows between 42° and 62°. The average high for September is 75° with an average low of 51°. 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 Highlands Ranch. See also: October | November | December.
