S
M
T
W
T
F
S
26
92°
58°
27
95°
57°
28
97°
59°
29
97°
57°
30
98°
58°
31
99°
58°
1
98°
57°
2
98°
58°
3
97°
57°
4
94°
55°
5
91°
56°
6
91°
56°
7
95°
57°
8
96°
57°
9
95°
56°
10
95°
56°
11
93°
55°
12
94°
55°
13
93°
54°
14
95°
54°
15
96°
55°
16
98°
54°
17
97°
53°
18
98°
52°
19
97°
53°
20
94°
55°
21
94°
55°
22
99°
47°
23
96°
49°
24
92°
49°
25
93°
47°
26
92°
47°
27
92°
46°
28
91°
46°
29
89°
47°
30
88°
45°
31
89°
47°
1
90°
49°
2
95°
52°
3
92°
50°
4
86°
50°
5
89°
46°
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 86° to 99°, with overnight lows between 45° and 59°. The average high for August is 94° with an average low of 53°. 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.
