S
M
T
W
T
F
S
26
86°
60°
27
86°
61°
28
87°
62°
29
88°
60°
30
85°
61°
31
89°
62°
1
89°
63°
2
88°
63°
3
88°
65°
4
87°
64°
5
88°
63°
6
88°
64°
7
85°
64°
8
84°
63°
9
86°
64°
10
88°
63°
11
88°
64°
12
87°
62°
13
88°
59°
14
84°
61°
15
85°
60°
16
86°
59°
17
86°
62°
18
86°
61°
19
84°
59°
20
86°
61°
21
84°
61°
22
Hist. Avg.
86°
60°
23
Hist. Avg.
86°
60°
24
Hist. Avg.
86°
60°
25
Hist. Avg.
86°
60°
26
Hist. Avg.
85°
60°
27
Hist. Avg.
85°
60°
28
Hist. Avg.
85°
60°
29
Hist. Avg.
85°
59°
30
Hist. Avg.
85°
59°
31
Hist. Avg.
85°
59°
1
Hist. Avg.
84°
59°
2
Hist. Avg.
84°
59°
3
Hist. Avg.
84°
58°
4
Hist. Avg.
84°
58°
5
Hist. Avg.
84°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Fontana Dam
Fontana Dam's August 2026 forecast shows daily high temperatures ranging from 84° to 89°, with overnight lows between 59° and 65°. The average high for August is 87° with an average low of 62°. 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 Fontana Dam. See also: September | October | November.
