S
M
T
W
T
F
S
30
88°
67°
31
88°
64°
1
82°
64°
2
83°
67°
3
87°
62°
4
88°
68°
5
88°
67°
6
87°
66°
7
87°
61°
8
81°
60°
9
82°
60°
10
85°
62°
11
86°
63°
12
86°
62°
13
82°
61°
14
80°
64°
15
84°
63°
16
85°
63°
17
84°
57°
18
78°
56°
19
76°
57°
20
77°
62°
21
77°
62°
22
81°
57°
23
78°
61°
24
76°
60°
25
76°
61°
26
79°
61°
27
82°
60°
28
82°
56°
29
77°
59°
30
76°
59°
1
75°
60°
2
79°
58°
3
78°
52°
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 75° to 88°, with overnight lows between 52° and 68°. The average high for September is 82° with an average low of 61°. 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.
