S
M
T
W
T
F
S
31
83°
60°
1
87°
61°
2
87°
52°
3
84°
58°
4
88°
65°
5
85°
68°
6
83°
65°
7
85°
66°
8
84°
65°
9
87°
64°
10
85°
65°
11
86°
66°
12
87°
62°
13
84°
61°
14
82°
62°
15
84°
61°
16
77°
58°
17
77°
58°
18
79°
62°
19
79°
63°
20
80°
64°
21
81°
65°
22
83°
66°
23
82°
63°
24
85°
66°
25
85°
67°
26
88°
66°
27
85°
67°
28
83°
65°
29
83°
64°
30
84°
65°
1
83°
66°
2
83°
68°
3
86°
66°
4
83°
62°
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 77° to 88°, with overnight lows between 52° and 68°. The average high for June is 84° with an average low of 64°. 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.
