S
M
T
W
T
F
S
26
42°
17°
27
43°
17°
28
44°
20°
29
45°
19°
30
42°
19°
1
44°
20°
2
45°
21°
3
46°
21°
4
47°
26°
5
48°
23°
6
52°
23°
7
56°
24°
8
57°
25°
9
51°
24°
10
51°
25°
11
52°
26°
12
52°
26°
13
53°
27°
14
53°
27°
15
59°
28°
16
60°
31°
17
57°
28°
18
52°
28°
19
53°
29°
20
54°
30°
21
55°
29°
22
56°
32°
23
58°
32°
24
61°
34°
25
62°
38°
26
63°
37°
27
66°
36°
28
63°
35°
29
64°
38°
30
67°
41°
31
67°
40°
1
68°
36°
2
70°
35°
3
60°
35°
4
60°
37°
5
61°
38°
6
69°
42°
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 42° to 70°, with overnight lows between 17° and 42°. The average high for May is 55° with an average low of 29°. 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.
