S
M
T
W
T
F
S
26
68°
48°
27
63°
45°
28
54°
39°
29
57°
36°
30
55°
36°
1
57°
30°
2
64°
27°
3
72°
43°
4
79°
41°
5
57°
39°
6
57°
32°
7
70°
36°
8
75°
41°
9
72°
39°
10
70°
32°
11
81°
39°
12
79°
55°
13
77°
41°
14
79°
48°
15
88°
52°
16
82°
57°
17
81°
61°
18
70°
54°
19
55°
41°
20
57°
37°
21
57°
48°
22
70°
54°
23
73°
48°
24
N/A
25
85°
59°
26
86°
58°
27
83°
60°
28
82°
62°
29
80°
59°
30
73°
54°
31
74°
55°
1
78°
51°
2
77°
54°
3
78°
55°
4
80°
58°
5
78°
56°
6
82°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Walnut
Walnut's May 2026 forecast shows daily high temperatures ranging from 73° to 86°, with overnight lows between 51° and 62°. The average high for May is 80° with an average low of 57°. 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 Walnut. See also: June | July | August.
