S
M
T
W
T
F
S
30
91°
61°
31
92°
60°
1
92°
61°
2
91°
61°
3
90°
60°
4
90°
60°
5
89°
59°
6
89°
51°
7
81°
50°
8
79°
54°
9
80°
55°
10
79°
54°
11
80°
57°
12
87°
57°
13
88°
46°
14
86°
45°
15
77°
45°
16
74°
46°
17
76°
49°
18
81°
49°
19
79°
45°
20
75°
46°
21
76°
52°
22
83°
52°
23
84°
53°
24
83°
53°
25
83°
52°
26
84°
53°
27
83°
52°
28
81°
48°
29
78°
47°
30
77°
46°
1
74°
45°
2
76°
48°
3
70°
37°
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 70° to 92°, with overnight lows between 37° and 61°. The average high for September is 82° with an average low of 52°. 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.
