S
M
T
W
T
F
S
26
80°
58°
27
78°
57°
28
76°
57°
29
77°
59°
30
78°
58°
31
78°
57°
1
79°
59°
2
78°
59°
3
77°
62°
4
79°
64°
5
81°
59°
6
81°
62°
7
80°
59°
8
79°
62°
9
80°
58°
10
79°
57°
11
80°
58°
12
79°
58°
13
77°
59°
14
76°
60°
15
76°
58°
16
75°
59°
17
76°
60°
18
78°
63°
19
82°
63°
20
83°
64°
21
82°
64°
22
82°
63°
23
81°
63°
24
81°
58°
25
80°
57°
26
74°
59°
27
75°
56°
28
76°
58°
29
73°
60°
30
78°
63°
31
79°
62°
1
81°
54°
2
79°
53°
3
Hist. Avg.
75°
57°
4
Hist. Avg.
75°
57°
5
Hist. Avg.
74°
56°
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 73° to 83°, with overnight lows between 53° and 64°. The average high for August is 79° with an average low of 59°. 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.
