S
M
T
W
T
F
S
26
98°
66°
27
98°
66°
28
97°
68°
29
98°
68°
30
98°
67°
31
97°
68°
1
97°
67°
2
96°
65°
3
93°
66°
4
93°
67°
5
95°
67°
6
96°
66°
7
95°
67°
8
96°
67°
9
97°
66°
10
98°
67°
11
99°
66°
12
98°
66°
13
99°
65°
14
98°
67°
15
96°
66°
16
Hist. Avg.
97°
64°
17
Hist. Avg.
97°
64°
18
Hist. Avg.
97°
64°
19
Hist. Avg.
97°
64°
20
Hist. Avg.
97°
64°
21
Hist. Avg.
97°
64°
22
Hist. Avg.
97°
64°
23
Hist. Avg.
97°
64°
24
Hist. Avg.
97°
63°
25
Hist. Avg.
97°
63°
26
Hist. Avg.
98°
63°
27
Hist. Avg.
98°
63°
28
Hist. Avg.
98°
63°
29
Hist. Avg.
98°
63°
30
Hist. Avg.
98°
63°
31
Hist. Avg.
97°
63°
1
Hist. Avg.
97°
63°
2
Hist. Avg.
97°
63°
3
Hist. Avg.
97°
63°
4
Hist. Avg.
97°
62°
5
Hist. Avg.
97°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Fontana
Fontana's August 2026 forecast shows daily high temperatures ranging from 93° to 99°, with overnight lows between 65° and 68°. The average high for August is 97° with an average low of 67°. 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. See also: September | October | November.
