S
M
T
W
T
F
S
26
87°
67°
27
87°
66°
28
83°
66°
29
82°
65°
30
79°
65°
31
79°
64°
1
78°
64°
2
78°
63°
3
79°
64°
4
80°
63°
5
79°
62°
6
78°
60°
7
78°
60°
8
79°
63°
9
79°
64°
10
81°
64°
11
81°
63°
12
82°
64°
13
82°
64°
14
83°
63°
15
80°
63°
16
78°
61°
17
78°
60°
18
79°
61°
19
82°
63°
20
84°
62°
21
77°
54°
22
75°
53°
23
76°
55°
24
78°
54°
25
77°
55°
26
80°
62°
27
81°
63°
28
84°
63°
29
85°
57°
30
84°
54°
31
76°
57°
1
76°
62°
2
80°
58°
3
81°
60°
4
82°
60°
5
83°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Walnut Creek
Walnut Creek's August 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 53° and 67°. The average high for August is 80° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Walnut Creek. See also: September | October | November.
