S
M
T
W
T
F
S
26
84°
57°
27
84°
63°
28
77°
64°
29
73°
61°
30
68°
52°
1
66°
46°
2
67°
42°
3
70°
52°
4
78°
57°
5
78°
63°
6
71°
46°
7
67°
44°
8
71°
50°
9
73°
53°
10
75°
55°
11
77°
59°
12
77°
55°
13
76°
55°
14
80°
56°
15
79°
61°
16
80°
60°
17
80°
61°
18
82°
61°
19
81°
62°
20
83°
62°
21
83°
61°
22
80°
62°
23
77°
62°
24
79°
61°
25
82°
63°
26
79°
63°
27
77°
58°
28
78°
59°
29
81°
61°
30
80°
59°
31
82°
63°
1
82°
64°
2
85°
64°
3
86°
65°
4
84°
63°
5
80°
60°
6
79°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Walnut
Walnut's May 2026 forecast shows daily high temperatures ranging from 66° to 86°, with overnight lows between 42° and 65°. The average high for May is 78° with an average low of 58°. 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.
