S
M
T
W
T
F
S
26
80°
51°
27
85°
55°
28
80°
61°
29
70°
56°
30
64°
46°
1
64°
43°
2
62°
40°
3
67°
37°
4
82°
51°
5
77°
59°
6
64°
50°
7
65°
45°
8
73°
40°
9
77°
57°
10
78°
53°
11
74°
52°
12
77°
47°
13
78°
57°
14
68°
48°
15
79°
42°
16
85°
66°
17
90°
64°
18
91°
72°
19
89°
67°
20
74°
65°
21
73°
65°
22
75°
68°
23
81°
66°
24
83°
67°
25
82°
66°
26
80°
68°
27
81°
68°
28
82°
67°
29
81°
63°
30
82°
63°
31
87°
71°
1
85°
66°
2
86°
65°
3
83°
64°
4
79°
60°
5
79°
60°
6
84°
67°
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 73° to 91°, with overnight lows between 60° and 72°. The average high for May is 82° with an average low of 66°. 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.
