S
M
T
W
T
F
S
26
65°
53°
27
66°
53°
28
74°
49°
29
75°
51°
30
75°
54°
1
78°
57°
2
76°
55°
3
67°
57°
4
67°
53°
5
65°
54°
6
76°
54°
7
81°
56°
8
80°
56°
9
85°
57°
10
89°
57°
11
89°
58°
12
81°
59°
13
80°
57°
14
78°
55°
15
78°
57°
16
74°
56°
17
75°
56°
18
74°
55°
19
79°
55°
20
73°
51°
21
74°
52°
22
73°
51°
23
74°
52°
24
79°
55°
25
81°
56°
26
81°
54°
27
76°
52°
28
75°
52°
29
75°
53°
30
79°
55°
31
80°
57°
1
83°
58°
2
82°
57°
3
79°
55°
4
75°
57°
5
76°
57°
6
77°
56°
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 73° to 89°, with overnight lows between 51° and 59°. The average high for May is 78° with an average low of 55°. 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.
