S
M
T
W
T
F
S
26
91°
71°
27
84°
70°
28
81°
58°
29
82°
55°
30
86°
54°
31
77°
60°
1
69°
64°
2
78°
58°
3
82°
55°
4
84°
58°
5
79°
66°
6
80°
62°
7
85°
65°
8
80°
59°
9
76°
56°
10
85°
68°
11
81°
69°
12
83°
66°
13
76°
63°
14
80°
65°
15
78°
68°
16
81°
59°
17
79°
56°
18
78°
63°
19
78°
57°
20
76°
56°
21
77°
59°
22
78°
61°
23
80°
60°
24
78°
58°
25
77°
57°
26
76°
58°
27
80°
57°
28
74°
56°
29
77°
58°
30
81°
61°
31
82°
61°
1
83°
62°
2
83°
61°
3
82°
60°
4
81°
60°
5
81°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Fontana-on-Geneva Lake
Fontana-on-Geneva Lake's August 2026 forecast shows daily high temperatures ranging from 74° to 83°, with overnight lows between 56° and 68°. The average high for August is 79° with an average low of 60°. 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-on-Geneva Lake. See also: September | October | November.
