S
M
T
W
T
F
S
26
80°
45°
27
83°
47°
28
80°
52°
29
73°
62°
30
67°
62°
31
78°
60°
1
83°
62°
2
83°
67°
3
80°
65°
4
82°
62°
5
82°
63°
6
79°
62°
7
84°
64°
8
84°
64°
9
83°
66°
10
81°
62°
11
80°
61°
12
78°
66°
13
78°
65°
14
81°
64°
15
76°
62°
16
75°
60°
17
75°
64°
18
76°
64°
19
74°
60°
20
74°
60°
21
75°
64°
22
74°
63°
23
74°
63°
24
75°
62°
25
73°
61°
26
74°
60°
27
73°
57°
28
73°
57°
29
72°
59°
30
72°
56°
31
74°
62°
1
76°
63°
2
77°
63°
3
74°
61°
4
72°
60°
5
71°
58°
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 67° to 84°, with overnight lows between 56° and 67°. The average high for August is 77° with an average low of 62°. 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.
