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
74°
54°
16
83°
54°
17
80°
61°
18
84°
59°
19
74°
52°
20
72°
49°
21
73°
50°
22
81°
51°
23
72°
58°
24
67°
55°
25
74°
51°
26
78°
52°
27
80°
52°
28
68°
58°
29
67°
54°
30
58°
49°
1
68°
44°
2
76°
47°
3
81°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Castle Pines
Castle Pines's September 2026 forecast shows daily high temperatures ranging from 58° to 81°, with overnight lows between 44° and 49°. The average high for September is 71° with an average low of 47°. 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 Castle Pines. See also: October | November | December.
