S
M
T
W
T
F
S
26
63°
51°
27
66°
43°
28
74°
44°
29
75°
46°
30
78°
49°
1
74°
51°
2
59°
52°
3
64°
53°
4
66°
48°
5
60°
51°
6
71°
50°
7
80°
53°
8
73°
49°
9
76°
51°
10
80°
52°
11
89°
47°
12
74°
53°
13
76°
51°
14
82°
54°
15
85°
52°
16
82°
52°
17
84°
54°
18
91°
59°
19
85°
55°
20
82°
54°
21
82°
54°
22
83°
56°
23
83°
54°
24
84°
53°
25
79°
52°
26
73°
50°
27
74°
51°
28
79°
53°
29
75°
54°
30
74°
53°
31
78°
55°
1
83°
57°
2
83°
57°
3
82°
55°
4
77°
54°
5
83°
58°
6
83°
58°
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 73° to 91°, with overnight lows between 50° and 59°. The average high for May is 81° with an average low of 54°. 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.
