S
M
T
W
T
F
S
26
93°
72°
27
97°
72°
28
84°
66°
29
88°
64°
30
88°
68°
31
72°
63°
1
86°
63°
2
81°
64°
3
84°
61°
4
73°
64°
5
77°
55°
6
81°
52°
7
81°
63°
8
81°
59°
9
81°
63°
10
84°
66°
11
84°
70°
12
86°
66°
13
79°
66°
14
81°
66°
15
81°
66°
16
81°
61°
17
84°
57°
18
81°
63°
19
79°
55°
20
81°
52°
21
82°
63°
22
81°
57°
23
79°
50°
24
81°
52°
25
76°
62°
26
77°
58°
27
79°
54°
28
80°
62°
29
77°
64°
30
80°
66°
31
81°
61°
1
75°
58°
2
76°
59°
3
77°
57°
4
75°
58°
5
76°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Lewiston
Lewiston's August 2026 forecast shows daily high temperatures ranging from 75° to 81°, with overnight lows between 54° and 66°. The average high for August is 77° with an average low of 60°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Lewiston. See also: September | October | November.
