S
M
T
W
T
F
S
26
61°
40°
27
74°
38°
28
63°
54°
29
54°
43°
30
50°
37°
1
47°
32°
2
47°
30°
3
56°
31°
4
71°
48°
5
65°
45°
6
49°
41°
7
51°
41°
8
55°
44°
9
55°
47°
10
54°
41°
11
54°
41°
12
55°
43°
13
56°
46°
14
61°
47°
15
61°
47°
16
60°
48°
17
60°
48°
18
59°
47°
19
65°
48°
20
71°
52°
21
69°
52°
22
64°
45°
23
61°
43°
24
63°
44°
25
62°
46°
26
64°
47°
27
64°
46°
28
65°
46°
29
64°
47°
30
66°
49°
31
67°
51°
1
66°
50°
2
68°
51°
3
69°
57°
4
71°
54°
5
69°
58°
6
76°
59°
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 49° to 76°, with overnight lows between 41° and 59°. The average high for May is 62° with an average low of 48°. 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.
