S
M
T
W
T
F
S
31
82°
70°
1
86°
66°
2
82°
59°
3
83°
61°
4
88°
70°
5
85°
70°
6
85°
70°
7
84°
68°
8
80°
65°
9
83°
66°
10
88°
65°
11
84°
64°
12
85°
69°
13
86°
65°
14
86°
65°
15
87°
67°
16
81°
63°
17
85°
67°
18
83°
66°
19
81°
67°
20
83°
67°
21
79°
61°
22
79°
65°
23
86°
69°
24
88°
70°
25
89°
69°
26
87°
68°
27
80°
68°
28
82°
67°
29
82°
69°
30
84°
69°
1
84°
68°
2
85°
69°
3
86°
69°
4
85°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Lewistown
Lewistown's June 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 61° and 70°. The average high for June is 84° with an average low of 67°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in Lewistown. See also: July | August | September.
