S
M
T
W
T
F
S
30
88°
68°
31
93°
65°
1
98°
71°
2
98°
71°
3
100°
69°
4
100°
70°
5
90°
70°
6
82°
63°
7
87°
59°
8
84°
56°
9
88°
59°
10
96°
69°
11
94°
71°
12
87°
70°
13
88°
71°
14
85°
63°
15
82°
56°
16
82°
56°
17
90°
59°
18
91°
70°
19
85°
66°
20
88°
62°
21
91°
69°
22
79°
64°
23
68°
60°
24
64°
52°
25
69°
52°
26
70°
54°
27
72°
55°
28
72°
56°
29
77°
57°
30
75°
55°
1
73°
57°
2
75°
55°
3
77°
61°
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 91°, with overnight lows between 52° and 69°. The average high for September is 74° with an average low of 57°. 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.
