S
M
T
W
T
F
S
31
69°
45°
1
71°
48°
2
73°
49°
3
73°
49°
4
72°
50°
5
72°
49°
6
73°
50°
7
73°
49°
8
65°
50°
9
65°
49°
10
67°
50°
11
70°
49°
12
63°
46°
13
63°
45°
14
65°
49°
15
74°
43°
16
68°
41°
17
66°
38°
18
64°
40°
19
67°
44°
20
71°
41°
21
67°
42°
22
67°
40°
23
65°
41°
24
69°
42°
25
69°
43°
26
68°
45°
27
72°
50°
28
79°
52°
29
80°
52°
30
81°
51°
1
81°
53°
2
82°
54°
3
83°
54°
4
82°
53°
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 63° to 83°, with overnight lows between 38° and 54°. The average high for June is 71° with an average low of 47°. 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.
