S
M
T
W
T
F
S
27
64°
57°
28
67°
57°
29
71°
60°
30
76°
60°
1
84°
59°
2
81°
56°
3
71°
48°
4
61°
47°
5
69°
52°
6
64°
38°
7
75°
37°
8
73°
44°
9
72°
38°
10
70°
40°
11
59°
54°
12
74°
53°
13
82°
62°
14
76°
55°
15
68°
47°
16
66°
42°
17
54°
35°
18
56°
36°
19
64°
41°
20
65°
46°
21
65°
46°
22
62°
43°
23
62°
39°
24
61°
40°
25
58°
38°
26
64°
42°
27
63°
33°
28
53°
33°
29
52°
32°
30
53°
32°
31
60°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Lewistown
Lewistown's October 2026 forecast shows daily high temperatures ranging from 52° to 82°, with overnight lows between 32° and 62°. The average high for October is 63° with an average low of 42°. 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 Lewistown. See also: November | December | January.
