S
M
T
W
T
F
S
26
85°
72°
27
93°
75°
28
84°
70°
29
68°
60°
30
65°
59°
1
67°
57°
2
78°
54°
3
80°
59°
4
80°
64°
5
90°
62°
6
62°
54°
7
72°
53°
8
76°
63°
9
91°
70°
10
77°
64°
11
77°
59°
12
85°
63°
13
90°
64°
14
90°
70°
15
88°
70°
16
89°
72°
17
88°
75°
18
91°
79°
19
86°
65°
20
81°
64°
21
75°
70°
22
89°
69°
23
81°
69°
24
86°
69°
25
86°
67°
26
84°
68°
27
78°
67°
28
85°
67°
29
88°
68°
30
88°
69°
31
81°
65°
1
80°
65°
2
83°
66°
3
81°
64°
4
83°
66°
5
89°
71°
6
86°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Richardson
Richardson's May 2026 forecast shows daily high temperatures ranging from 78° to 89°, with overnight lows between 64° and 73°. The average high for May is 84° with an average low of 68°. 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 Richardson. See also: June | July | August.
