S
M
T
W
T
F
S
27
71°
55°
28
75°
53°
29
76°
45°
30
68°
51°
1
73°
54°
2
75°
51°
3
73°
47°
4
69°
44°
5
65°
43°
6
64°
44°
7
67°
48°
8
71°
51°
9
71°
50°
10
71°
48°
11
62°
48°
12
62°
44°
13
61°
41°
14
Hist. Avg.
66°
43°
15
Hist. Avg.
65°
43°
16
Hist. Avg.
65°
42°
17
Hist. Avg.
65°
42°
18
Hist. Avg.
64°
42°
19
Hist. Avg.
64°
41°
20
Hist. Avg.
63°
41°
21
Hist. Avg.
63°
41°
22
Hist. Avg.
63°
40°
23
Hist. Avg.
62°
40°
24
Hist. Avg.
62°
40°
25
Hist. Avg.
62°
39°
26
Hist. Avg.
61°
39°
27
Hist. Avg.
61°
38°
28
Hist. Avg.
60°
38°
29
Hist. Avg.
60°
38°
30
Hist. Avg.
60°
38°
31
Hist. Avg.
59°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
October Weather in Lewistown
Lewistown's October 2026 forecast shows daily high temperatures ranging from 61° to 76°, with overnight lows between 41° and 55°. The average high for October is 69° with an average low of 48°. 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.
