S
M
T
W
T
F
S
30
74°
51°
31
73°
50°
1
75°
54°
2
75°
59°
3
74°
60°
4
82°
60°
5
83°
59°
6
82°
51°
7
79°
50°
8
74°
50°
9
74°
49°
10
72°
52°
11
72°
54°
12
71°
49°
13
75°
53°
14
78°
55°
15
77°
53°
16
70°
54°
17
71°
53°
18
73°
52°
19
76°
46°
20
71°
48°
21
73°
45°
22
74°
44°
23
68°
44°
24
67°
45°
25
67°
47°
26
68°
43°
27
66°
43°
28
66°
45°
29
64°
41°
30
65°
41°
1
64°
46°
2
71°
41°
3
68°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Littleton
Littleton's September 2026 forecast shows daily high temperatures ranging from 64° to 83°, with overnight lows between 41° and 60°. The average high for September is 72° 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 Littleton. See also: October | November | December.
