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
68°
52°
4
67°
55°
5
67°
53°
6
74°
53°
7
75°
52°
8
79°
56°
9
84°
55°
10
86°
57°
11
88°
56°
12
90°
56°
13
91°
56°
14
84°
54°
15
81°
55°
16
77°
52°
17
81°
57°
18
80°
56°
19
81°
57°
20
82°
57°
21
81°
55°
22
80°
55°
23
81°
57°
24
82°
57°
25
83°
56°
26
82°
56°
27
76°
55°
28
75°
55°
29
76°
56°
30
77°
56°
31
78°
58°
1
80°
58°
2
83°
57°
3
81°
58°
4
77°
57°
5
78°
56°
6
76°
55°
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 67° to 91°, with overnight lows between 52° and 58°. The average high for May is 79° 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 Creek. See also: June | July | August.
