S
M
T
W
T
F
S
26
78°
65°
27
83°
62°
28
82°
71°
29
82°
66°
30
77°
67°
1
68°
56°
2
75°
50°
3
79°
45°
4
77°
52°
5
78°
53°
6
76°
72°
7
80°
65°
8
71°
65°
9
71°
65°
10
82°
65°
11
84°
65°
12
81°
67°
13
88°
64°
14
87°
58°
15
82°
55°
16
82°
61°
17
83°
62°
18
85°
72°
19
86°
74°
20
86°
70°
21
85°
76°
22
86°
69°
23
85°
69°
24
78°
69°
25
76°
69°
26
78°
70°
27
85°
71°
28
80°
70°
29
81°
69°
30
82°
71°
31
83°
70°
1
82°
67°
2
83°
68°
3
84°
67°
4
86°
66°
5
85°
69°
6
88°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Pennsylvania
Pennsylvania's May 2026 forecast shows daily high temperatures ranging from 76° to 88°, with overnight lows between 66° and 71°. The average high for May is 82° with an average low of 69°. 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 Pennsylvania. See also: June | July | August.
