S
M
T
W
T
F
S
26
65°
29°
27
71°
31°
28
62°
32°
29
55°
42°
30
47°
42°
1
60°
34°
2
45°
32°
3
53°
31°
4
67°
45°
5
74°
54°
6
65°
51°
7
61°
43°
8
58°
36°
9
57°
44°
10
61°
44°
11
59°
45°
12
62°
44°
13
62°
47°
14
61°
47°
15
59°
46°
16
64°
47°
17
63°
46°
18
64°
52°
19
69°
51°
20
67°
51°
21
64°
50°
22
66°
52°
23
63°
50°
24
61°
48°
25
63°
49°
26
63°
52°
27
64°
50°
28
64°
48°
29
65°
47°
30
64°
51°
31
65°
54°
1
67°
51°
2
66°
49°
3
67°
55°
4
71°
55°
5
67°
54°
6
67°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Lewiston
Lewiston's May 2026 forecast shows daily high temperatures ranging from 57° to 74°, with overnight lows between 36° and 56°. The average high for May is 64° with an average low of 49°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Lewiston. See also: June | July | August.
