S
M
T
W
T
F
S
26
89°
63°
27
93°
60°
28
90°
61°
29
90°
63°
30
93°
64°
31
100°
60°
1
93°
67°
2
80°
58°
3
81°
54°
4
88°
54°
5
95°
57°
6
98°
59°
7
99°
62°
8
96°
62°
9
93°
60°
10
91°
58°
11
92°
60°
12
90°
61°
13
87°
64°
14
89°
65°
15
83°
64°
16
94°
61°
17
94°
65°
18
95°
66°
19
95°
59°
20
99°
60°
21
106°
65°
22
95°
68°
23
85°
64°
24
90°
55°
25
99°
62°
26
98°
66°
27
89°
65°
28
85°
58°
29
79°
60°
30
77°
51°
31
89°
52°
1
80°
59°
2
75°
57°
3
68°
52°
4
72°
52°
5
74°
49°
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 ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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.
