S
M
T
W
T
F
S
26
60°
36°
27
68°
40°
28
64°
43°
29
59°
48°
30
61°
39°
1
56°
37°
2
56°
36°
3
53°
38°
4
58°
42°
5
63°
43°
6
65°
43°
7
63°
42°
8
62°
45°
9
63°
44°
10
64°
45°
11
64°
46°
12
66°
50°
13
65°
45°
14
64°
42°
15
63°
42°
16
61°
44°
17
62°
42°
18
65°
43°
19
71°
49°
20
68°
44°
21
66°
44°
22
67°
45°
23
66°
44°
24
68°
48°
25
76°
53°
26
72°
46°
27
67°
46°
28
67°
47°
29
70°
50°
30
77°
54°
31
77°
54°
1
78°
56°
2
79°
57°
3
80°
57°
4
80°
56°
5
77°
50°
6
71°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Lehigh Valley
Lehigh Valley's May 2026 forecast shows daily high temperatures ranging from 53° to 80°, with overnight lows between 36° and 57°. The average high for May is 67° with an average low of 46°. 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 Lehigh Valley. See also: June | July | August.
