S
M
T
W
T
F
S
26
46°
23°
27
46°
24°
28
47°
25°
29
48°
24°
30
49°
24°
1
52°
25°
2
52°
21°
3
53°
22°
4
51°
22°
5
48°
26°
6
49°
25°
7
50°
23°
8
49°
24°
9
49°
23°
10
50°
24°
11
52°
25°
12
56°
27°
13
58°
27°
14
59°
28°
15
59°
30°
16
61°
30°
17
62°
31°
18
62°
31°
19
61°
35°
20
63°
35°
21
63°
34°
22
62°
32°
23
61°
31°
24
59°
31°
25
61°
32°
26
59°
32°
27
60°
33°
28
57°
32°
29
57°
32°
30
56°
33°
31
57°
33°
1
63°
38°
2
60°
41°
3
67°
41°
4
68°
38°
5
68°
37°
6
62°
39°
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 46° to 68°, with overnight lows between 21° and 41°. The average high for May is 56° with an average low of 30°. 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.
