S
M
T
W
T
F
S
26
71°
54°
27
73°
57°
28
78°
61°
29
77°
58°
30
81°
62°
1
83°
61°
2
81°
60°
3
81°
63°
4
83°
65°
5
84°
65°
6
84°
64°
7
83°
66°
8
84°
66°
9
81°
65°
10
75°
61°
11
76°
60°
12
75°
58°
13
76°
61°
14
78°
66°
15
79°
66°
16
82°
68°
17
86°
68°
18
87°
64°
19
78°
63°
20
76°
63°
21
79°
69°
22
83°
66°
23
80°
64°
24
87°
70°
25
86°
71°
26
87°
70°
27
85°
65°
28
81°
65°
29
90°
69°
30
87°
68°
31
86°
65°
1
87°
69°
2
90°
65°
3
91°
66°
4
91°
70°
5
93°
72°
6
92°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Plano
Plano's May 2026 forecast shows daily high temperatures ranging from 71° to 93°, with overnight lows between 54° and 72°. The average high for May is 83° with an average low of 65°. 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 Plano. See also: June | July | August.
