S
M
T
W
T
F
S
27
78°
50°
28
77°
49°
29
67°
47°
30
74°
43°
1
71°
45°
2
77°
47°
3
76°
47°
4
77°
46°
5
75°
47°
6
74°
47°
7
75°
46°
8
67°
45°
9
65°
42°
10
68°
36°
11
60°
34°
12
61°
35°
13
57°
35°
14
58°
34°
15
70°
38°
16
70°
39°
17
58°
38°
18
56°
37°
19
57°
38°
20
57°
39°
21
63°
41°
22
65°
41°
23
58°
33°
24
59°
28°
25
57°
28°
26
54°
32°
27
57°
31°
28
64°
32°
29
58°
28°
30
54°
26°
31
51°
27°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Boulder
Boulder's October 2026 forecast shows daily high temperatures ranging from 51° to 78°, with overnight lows between 26° and 50°. The average high for October is 65° with an average low of 39°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Boulder. See also: November | December | January.
