S
M
T
W
T
F
S
30
84°
55°
31
84°
54°
1
85°
51°
2
80°
55°
3
81°
59°
4
89°
59°
5
88°
58°
6
89°
55°
7
85°
53°
8
79°
51°
9
86°
49°
10
79°
51°
11
79°
53°
12
82°
53°
13
83°
54°
14
78°
56°
15
86°
53°
16
85°
43°
17
77°
42°
18
75°
42°
19
73°
44°
20
75°
45°
21
75°
51°
22
82°
54°
23
81°
51°
24
82°
41°
25
76°
40°
26
72°
41°
27
69°
40°
28
71°
41°
29
71°
41°
30
72°
50°
1
81°
39°
2
Hist. Avg.
70°
43°
3
Hist. Avg.
70°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Arapahoe
Arapahoe's September 2026 forecast shows daily high temperatures ranging from 69° to 89°, with overnight lows between 39° and 59°. The average high for September is 80° with an average low of 49°. 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 Arapahoe. See also: October | November | December.
