S
M
T
W
T
F
S
26
81°
56°
27
78°
56°
28
77°
62°
29
81°
56°
30
75°
53°
1
66°
53°
2
64°
48°
3
67°
47°
4
71°
52°
5
74°
57°
6
74°
54°
7
76°
55°
8
76°
57°
9
77°
56°
10
74°
54°
11
75°
54°
12
81°
60°
13
82°
61°
14
83°
61°
15
77°
55°
16
74°
54°
17
74°
54°
18
76°
55°
19
77°
57°
20
80°
59°
21
83°
62°
22
84°
63°
23
83°
63°
24
84°
64°
25
84°
64°
26
85°
65°
27
85°
64°
28
80°
63°
29
79°
65°
30
79°
65°
31
82°
64°
1
80°
66°
2
80°
66°
3
81°
65°
4
81°
66°
5
80°
67°
6
82°
67°
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 64° to 85°, with overnight lows between 47° and 67°. The average high for May is 78° with an average low of 59°. 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.
