S
M
T
W
T
F
S
26
61°
41°
27
71°
35°
28
60°
39°
29
62°
48°
30
61°
45°
1
63°
36°
2
57°
36°
3
56°
37°
4
67°
46°
5
77°
59°
6
66°
56°
7
63°
37°
8
57°
35°
9
58°
40°
10
62°
43°
11
62°
45°
12
61°
43°
13
62°
46°
14
65°
48°
15
67°
46°
16
74°
52°
17
75°
53°
18
75°
52°
19
74°
51°
20
75°
53°
21
75°
52°
22
73°
46°
23
67°
44°
24
66°
45°
25
67°
46°
26
68°
46°
27
68°
47°
28
69°
47°
29
68°
46°
30
68°
47°
31
70°
56°
1
72°
53°
2
70°
48°
3
71°
53°
4
75°
55°
5
72°
52°
6
76°
56°
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 56° to 77°, with overnight lows between 35° and 59°. The average high for May is 68° 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 Lehigh Valley. See also: June | July | August.
