S
M
T
W
T
F
S
30
81°
59°
31
84°
59°
1
85°
59°
2
88°
59°
3
90°
60°
4
90°
63°
5
89°
63°
6
85°
62°
7
87°
61°
8
82°
59°
9
81°
57°
10
77°
56°
11
78°
58°
12
76°
56°
13
75°
53°
14
74°
54°
15
76°
47°
16
81°
53°
17
82°
52°
18
77°
52°
19
76°
49°
20
66°
47°
21
69°
44°
22
75°
48°
23
78°
50°
24
78°
50°
25
68°
42°
26
63°
38°
27
66°
41°
28
67°
43°
29
75°
42°
30
72°
43°
1
75°
45°
2
64°
40°
3
68°
41°
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 63° to 90°, with overnight lows between 38° and 63°. The average high for September is 77° 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 Chatfield State Park. See also: October | November | December.
