S
M
T
W
T
F
S
30
80°
51°
31
80°
51°
1
81°
52°
2
81°
51°
3
80°
43°
4
75°
41°
5
71°
46°
6
72°
50°
7
78°
50°
8
78°
48°
9
79°
49°
10
77°
47°
11
76°
44°
12
77°
48°
13
77°
49°
14
76°
48°
15
77°
47°
16
77°
39°
17
73°
47°
18
73°
45°
19
72°
41°
20
71°
38°
21
65°
35°
22
64°
42°
23
65°
39°
24
65°
36°
25
63°
35°
26
62°
34°
27
63°
42°
28
70°
40°
29
69°
36°
30
63°
34°
1
62°
37°
2
62°
31°
3
60°
34°
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 60° to 81°, with overnight lows between 31° and 52°. The average high for September is 72° with an average low of 43°. 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.
