S
M
T
W
T
F
S
30
81°
59°
31
84°
59°
1
85°
59°
2
88°
59°
3
90°
62°
4
90°
63°
5
86°
63°
6
85°
62°
7
84°
63°
8
87°
61°
9
81°
57°
10
77°
57°
11
78°
55°
12
79°
56°
13
80°
54°
14
77°
48°
15
80°
53°
16
81°
53°
17
82°
52°
18
81°
53°
19
80°
52°
20
80°
51°
21
79°
51°
22
80°
50°
23
79°
51°
24
79°
51°
25
78°
50°
26
78°
50°
27
77°
49°
28
77°
49°
29
76°
48°
30
75°
48°
1
75°
47°
2
73°
46°
3
74°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chatfield State Park
Chatfield State Park's September 2026 forecast shows daily high temperatures ranging from 73° to 90°, with overnight lows between 46° and 63°. The average high for September is 80° 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 Chatfield State Park. See also: October | November | December.
