S
M
T
W
T
F
S
26
80°
63°
27
81°
62°
28
75°
62°
29
73°
61°
30
73°
63°
1
75°
63°
2
74°
62°
3
73°
63°
4
73°
63°
5
74°
64°
6
75°
64°
7
76°
63°
8
75°
65°
9
75°
65°
10
77°
64°
11
79°
65°
12
79°
66°
13
80°
66°
14
81°
67°
15
81°
65°
16
78°
61°
17
80°
65°
18
84°
67°
19
86°
63°
20
82°
65°
21
81°
67°
22
85°
69°
23
87°
68°
24
87°
70°
25
89°
70°
26
89°
69°
27
90°
70°
28
90°
70°
29
89°
71°
30
90°
71°
31
91°
70°
1
91°
72°
2
90°
71°
3
91°
72°
4
92°
73°
5
93°
73°
6
92°
68°
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 73° to 93°, with overnight lows between 61° and 73°. 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 Richardson. See also: June | July | August.
