S
M
T
W
T
F
S
26
82°
58°
27
87°
66°
28
77°
56°
29
69°
50°
30
64°
43°
1
67°
46°
2
68°
43°
3
75°
57°
4
75°
61°
5
72°
46°
6
59°
42°
7
66°
47°
8
73°
53°
9
75°
55°
10
66°
54°
11
64°
48°
12
72°
53°
13
76°
57°
14
78°
56°
15
74°
58°
16
73°
55°
17
71°
58°
18
69°
59°
19
75°
59°
20
73°
58°
21
76°
52°
22
68°
51°
23
69°
53°
24
68°
55°
25
68°
53°
26
69°
52°
27
70°
54°
28
71°
55°
29
71°
58°
30
73°
63°
31
72°
62°
1
72°
60°
2
73°
58°
3
73°
63°
4
74°
64°
5
74°
64°
6
75°
63°
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 59° to 78°, with overnight lows between 42° and 64°. The average high for May is 71° with an average low of 56°. 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.
