S
M
T
W
T
F
S
26
61°
41°
27
71°
35°
28
60°
39°
29
62°
48°
30
61°
48°
1
61°
45°
2
55°
38°
3
57°
38°
4
64°
46°
5
74°
51°
6
63°
43°
7
59°
37°
8
57°
38°
9
58°
43°
10
61°
43°
11
63°
40°
12
61°
44°
13
65°
46°
14
65°
45°
15
65°
46°
16
66°
49°
17
66°
47°
18
67°
52°
19
74°
53°
20
73°
53°
21
72°
54°
22
75°
52°
23
72°
52°
24
74°
49°
25
68°
46°
26
69°
52°
27
68°
54°
28
70°
56°
29
75°
55°
30
74°
54°
31
74°
50°
1
70°
48°
2
67°
49°
3
67°
48°
4
70°
48°
5
69°
49°
6
70°
49°
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 55° to 75°, with overnight lows between 37° and 56°. The average high for May is 67° 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.
