S
M
T
W
T
F
S
30
96°
63°
31
93°
64°
1
97°
65°
2
99°
68°
3
100°
68°
4
99°
70°
5
97°
69°
6
94°
69°
7
95°
70°
8
98°
64°
9
95°
61°
10
88°
58°
11
85°
58°
12
88°
60°
13
85°
57°
14
92°
58°
15
86°
57°
16
85°
58°
17
87°
58°
18
87°
59°
19
86°
57°
20
86°
58°
21
85°
57°
22
86°
57°
23
85°
56°
24
84°
56°
25
84°
55°
26
82°
55°
27
83°
54°
28
83°
54°
29
82°
53°
30
82°
53°
1
81°
52°
2
81°
52°
3
80°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Colby
Colby's September 2026 forecast shows daily high temperatures ranging from 80° to 100°, with overnight lows between 51° and 70°. The average high for September is 88° with an average low of 59°. 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 Colby. See also: October | November | December.
