S
M
T
W
T
F
S
26
90°
50°
27
89°
50°
28
93°
52°
29
93°
55°
30
93°
52°
31
97°
52°
1
97°
56°
2
103°
56°
3
103°
65°
4
98°
62°
5
101°
61°
6
101°
61°
7
105°
63°
8
103°
57°
9
95°
56°
10
89°
54°
11
90°
57°
12
90°
56°
13
89°
57°
14
88°
56°
15
90°
57°
16
92°
56°
17
88°
57°
18
89°
59°
19
88°
57°
20
87°
56°
21
92°
58°
22
92°
58°
23
90°
57°
24
93°
59°
25
93°
59°
26
92°
60°
27
93°
59°
28
93°
59°
29
91°
58°
30
90°
59°
31
90°
58°
1
89°
57°
2
91°
58°
3
92°
58°
4
89°
57°
5
88°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Lake Berryessa
Lake Berryessa's August 2026 forecast shows daily high temperatures ranging from 87° to 105°, with overnight lows between 54° and 65°. The average high for August is 92° with an average low of 58°. 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 Lake Berryessa. See also: September | October | November.
