S
M
T
W
T
F
S
26
84°
63°
27
86°
61°
28
87°
64°
29
87°
65°
30
86°
64°
31
85°
64°
1
82°
63°
2
82°
63°
3
83°
64°
4
84°
63°
5
83°
61°
6
82°
60°
7
82°
60°
8
84°
63°
9
82°
64°
10
81°
63°
11
82°
61°
12
82°
62°
13
83°
60°
14
82°
59°
15
84°
62°
16
83°
64°
17
86°
65°
18
86°
64°
19
85°
63°
20
84°
64°
21
84°
57°
22
80°
56°
23
80°
57°
24
81°
58°
25
83°
59°
26
86°
62°
27
87°
63°
28
86°
63°
29
86°
62°
30
87°
62°
31
86°
63°
1
84°
61°
2
84°
60°
3
86°
59°
4
87°
62°
5
87°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Fontana Dam
Fontana Dam's August 2026 forecast shows daily high temperatures ranging from 80° to 87°, with overnight lows between 56° and 65°. The average high for August is 84° 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.
