S
M
T
W
T
F
S
26
64°
52°
27
66°
45°
28
72°
39°
29
75°
50°
30
72°
54°
1
57°
54°
2
55°
54°
3
66°
44°
4
79°
45°
5
79°
54°
6
82°
59°
7
72°
54°
8
72°
50°
9
76°
51°
10
85°
59°
11
75°
50°
12
72°
45°
13
79°
46°
14
77°
54°
15
73°
46°
16
84°
50°
17
90°
60°
18
93°
70°
19
91°
66°
20
91°
64°
21
88°
64°
22
68°
64°
23
72°
63°
24
83°
65°
25
81°
71°
26
88°
73°
27
88°
72°
28
87°
65°
29
83°
66°
30
83°
60°
31
77°
58°
1
76°
60°
2
78°
57°
3
79°
58°
4
81°
64°
5
80°
65°
6
82°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Walnut Creek
Walnut Creek's May 2026 forecast shows daily high temperatures ranging from 76° to 88°, with overnight lows between 57° and 72°. The average high for May is 81° with an average low of 63°. 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 Creek. See also: June | July | August.
