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
59°
44°
3
60°
42°
4
72°
40°
5
82°
51°
6
70°
51°
7
64°
47°
8
63°
40°
9
59°
46°
10
71°
45°
11
63°
47°
12
67°
39°
13
70°
52°
14
63°
48°
15
66°
47°
16
81°
43°
17
86°
59°
18
94°
61°
19
94°
65°
20
90°
61°
21
61°
51°
22
63°
48°
23
51°
47°
24
57°
52°
25
69°
57°
26
77°
56°
27
81°
53°
28
75°
52°
29
74°
54°
30
78°
55°
31
79°
56°
1
74°
54°
2
76°
52°
3
74°
53°
4
80°
57°
5
80°
59°
6
79°
58°
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 51° to 81°, with overnight lows between 47° and 59°. The average high for May is 72° with an average low of 54°. 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.
